Retirado do S2KI. Informação muito muito completa. Post by HvRRZ @ S2KI
Still getting info on the remaining systems available so stay with me 
Please feel free to post you experiences and reviews/results so that I may update the information in this thread.
Note: While there is a lot of info here...I believe it is also lacking of a lot of info as well. I will be updating as often as I can.
Should be noted that all cars are different, and while one car may receive X amount of HP/TQ gains from a product...another may receive something more or even less. This is just to give those of us some insight into products currently available for the S2K, with what info we have on them so far.
All exhausts perform best when they are matched with a test pipe. Best gains are seen this way. The idea is to match with a test pipe of same size as the exhaust piping for best results, and to eliminate the chance of a bottle neck effect. However, test pipes eliminate the stock catalytic converter and are advertised as strictly off road use. Many states will write a big fine if you are found driving around without a CAT. However, that doesn't stop to many people
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Picking the right exhaust is difficult. You want to pick the system that works best towards your needs and goals for the car. There are many available piping sizing, and single or dual exhaust set ups. The most proven systems performance wise are the 70mm systems which out shine all others. Not to down grade the smaller diameter piping systems because they give great gains also. A dual system will yield a bit less more in the performance factor, but may be quieter, and in some cases look nicer then most singles. They are however heavier then single systems. Single exhaust systems will drop the most amount of weight from the car, and give you the best results. They will also be a lot louder then most duals, not to say that some duals aren't loud though.
Main materials used for exhausts are stainless steal and titanium. In terms of power there is no difference between the two. In terms of weight the titanium system are a lot lighter then the stainless. There is a draw back to these light weight titanium systems though. They tend to be more brittle, and crack/break compared to the stainless. While this is not something that happens often, probably more so in tracking conditions, it is a good thing to note or those that may be concerned. People have had titanium exhausts and run into no problems with them, also these break downs tend to happen over the span of 5+ years so its not like you'll only get to use your exhaust for a weekend or month.
Remember to choose the system that will best suit your needs.
EXHAUSTSI have listed the typical pricing for each system. Do not let some of these prices discourage you. You can always find good deals for any of these systems.
5zigen Proracer GN+ - Discontinued
Piping is made of SUS 409 full stainless steel and the muffler is made of SUS 304 with an inconel cut-weld finish tip. Same size piping as the regular Pro Racer. This is one of the quietest single exhaust that was made. Slight angle out on the exit. Very rare system.
Sound Clip5Zigen Pro Racer X-3Not much information available at this time.
Air Walker - $1,350
This is a dual exhaust system. Unfortunately other then that there is no other information on this system.
Sound ClipAmuse Dual Euro - $2,700
60mm piping into two 45mm pipes at the split. This is a full titanium dual exhaust system. There is not much information on this system at the moment, but that it is a very quiet system with some decent minimal gains in power. It weighs in at 21 lbs. Very stock looking system OEM style system. The main benefits of this is the weight savings. Also similar to stock in sound.
Sound ClipAmuse Dual R1 - $2,750-$2,850
60mm piping into two 45mm pipes at the split. This is a full titanium exhaust system. It weighs in at 12.8 lbs which is very light for a dual system. This has shown to give decent gains of 4-6 hp. A good sounding system that stays below the legal DB levels. There should be no droning with this system. Higher results may be seen with a test pipe.
Amuse Dual Euro 70 22W - $2,900
This system is similar to that of the regular dual euro, however it uses 70mm piping then goes into two 50mm pipes at the split. It's another full titanium system and weighs in at 22.5 lbs. Like the dual euro this is another very quiet system, but with better performance gains. Similar OEM look.
Sound ClipAmuse Euro S - $2,450
60mm piping with a 100mm tip. Single exhaust system with an OEM looking canister and tip. This is a full titanium exhaust system. There is no real information on this system other then it is very quiet. Weighs in at 13 lbs.
Sound ClipAmuse R1000 Race - $2,500
70mm piping diameter with a 115mm tip. The exhaust uses a straight pipe integrated design with no silencer. This is the lightest Amuse exhaust weighing in at 9 lbs! I know I have listed other Amuse systems with lighter weights, but this is the lightest because it is 9 lbs as a full header back system. The other systems still need a test pipe to be complete, and will weigh a bit more. This system is very similar to that of the T1R 70RT. Expect similar results as the 70RT, and similar sound levels.
Sound ClipAmuse R1 Titan - $2,400
60mm piping diameter with a 100mm tip. This exhaust is also made entirely of titanium. It weighs in at 8.8 lbs. Incorporates a resonator, but is louder the the Dual Euro. Good gains both in the mid range and top end with this system.
Amuse R1 Titan Non Resonated - $2,295
60mm piping with a 100mm tip. Exactly the same as the regular R1 Titan without the resonator. This system weighs in at 7.3 lbs. Should be a bit louder then the regular R1, and possible more droning due to the fact that it does not have a resonator.
Apexi GT - $600
60mm piping diameter with a 115mm tip. Single exhaust system. Full Stainless steel construction, high flowing and said to give good results in terms of performance. Very good quality build. This is said to be a fairly quiet system, but has been also said to be loud especially with a test pipe, but it does come with a removable silencer.
Apex N1 - $575
60mm piping diameter with a 90mm tip. This exhaust system has a deep tone, and again is very high quality in build for its price. Also comes with a removable silencer.
Apexi World Sport II - $650
Dual exhaust system with 100mm tips. No Information for this system at this time.
Sound ClipARC Dual - $1,690
Full titanium construction. No other information on this system at this time.
ARC Single - $1,690
Full titanium construction. No other information on this system at this time.
ASM S-Special Type-T - $1,552
60mm piping diameter with 80mm tips. This is a dual exhaust system. This is a stainless system that weighs 42 lbs. There is not much info on this system in terms of performance, but it is sure to show some decent gains. Perfect exhaust for a daily driven S as it keeps the factory like sound and reduces the low rpm resonance. Increases toque at low rpm.
ASM S-Special Type-S 60mm $1,232
60mm piping diameter. Same as the Type-T except it is a single exit system. Main benefits over the Type-T is the decreased weight. This system weighs in at 24 lbs.
Dyno
ASM S-Special Type-S 70mm - $1,475
70mm piping diameter. Same design as the Type-S 60mm. Gains from 10-15hp and 10-12 tq seen through the power band with just the exhaust. Still a quiet system that weighs in at 28 lbs.
ASM Titan SPL - $2,723
70mm piping diameter. This is the exact same system as the Type-S 70mm, but made in full titanium. Expect the same gains as the Type-S 70mm. Exhaust note is slightly changed.
Asura 3" Dual - $1200
This is a full stainless steel 3" cat back exhaust system. This system weighs about 40 lbs. Perfect for any S with forced induction, but also great for an NA car. Stock looking tips and canisters, with an aggressive deep tone. This system can also be bought with AP2 style Oval tips. Also available in a single version.
Sound ClipBlitz Realize TT - $1,035
60mm piping diameter with 100mm tips. This is a dual stainless exhaust system. No other information at this time.
BorlaNo information on this system at this time.
BuddyClub Spec 3 - $525
Like the Apexi N1, it comes with a removable silencer. Sounds almost stock with it in and very aggressive when removed. Mufflers are made with SUS304 stainless steel, 1mm thick wall material is used for main pipe. 0.8mm wall stainless is used for main silencer. This combination of materials creates a super light weight system. Angled exit.
BuddyClub DualNo information on this system at this time.
BuddyClub Spec 4 - $525
The only difference between this and the BuddyClub Spec 3 is that this system has a built in silencer.
BuddyClub Pro Spec - $525
This is also similar to the BuddyClub Spec 3, but is a dual exhaust system. No other information available at this time.
Dyno - With Test Pipe
Burk Technology UHV ExhaustThis is a dual exhaust system with 57mm stainless steel piping. This exhaust weighs in at 26lbs with dual full titanium mufflers. The flow rate of this system is the same of a single 80mm system, but is roughly 6db quieter. Sound level is similar to a single 70mm system. Dyno has shown this system be give a healthy increase throughout the entire rpm range both in HP and TQ with the addition of a test pipe.
Comptech - $1,070
I believe this system is discontinued. Very good system for a strictly street driven S. Sound levels are very low, but it does have a great tone to it. Gains are minimal at best being mainly in the mid range. Looking or more information.
Feels Dual - $1,390
60mm piping diameter. Made out of stainless steal. No other information available at this time.
Feels Dual Ti Tip - $1,880
60mm piping diameter. Made of of stainless with titanium tips. No other information available at this time.
Feels Single - $930
60mm piping diameter. Made out of stainless steal. No other information available at this time.
Feels Single Ti Tip - $1,350
60mm piping diameter. Made of of stainless with titanium tips. No other information available at this time.
Sound ClipFujitsubo Legalis R - $808
Great sounding system thats very suitable for a daily driven S. Decent power gains as well. No other information available at this time.
Ganador Vertex SUS - $970
No information available at this time.
Ganador Vertex Titanium = $2,478
Full titanium single exhaust system. No other information available at this time.
Greddy EVO2 - Discontinued
70mm piping diameter. This is a dual exhaust system made out of stainless. Should show good gains being that it's a 70mm system. Great deep throaty exhaust note, but still comfortable for daily use. There is not much other information on this system at this time. Fits AP2s using AP1 exhaust hangers.
Greddy Spectrum Elite - $1,116
Dual cat back exhaust system. 70mm piping to two 60mm pipes after the split. 102mm tips with a burnt finish. 5hp peak gains seen with 10hp in some parts of the powerband. 94db at 6000rpm.
Greddy TI-C Dual - $822
70mm piping diameter into two 60mm pipes at the split. This system is made of stainless and has titanium tips. Improves high and mid range performance. Great sounding system that is still tolerable for daily use.
Greddy TI-C Single - $595
70mm piping diameter. Amazing looking system that improves power throughout the entire power band. Great mid range and peak horse power gains. No raspy sounds with this exhaust, but droning can be a bit much at lower rpms. This system weighs 23 lbs, and is made of stainless with a titanium tip.
HKS - $725
This is a dual exhaust system. 60mm piping diameter. Known to be one of the best sounding systems with a deep tone. However, this system has also shown to do nothing in regards to performance, and in some instances there have been recordings of a loss in power.
Inline Pro3" single system made of stainless steel. No resonator, and does drone quiet a bit. Mainly used for turbo cars, but can be used for an NA S for great gains also.
Invidia N1 Dual - $850
A favorite of many S2K owners. This is a very loud dual exhaust system with high droning. Great looking system that is known to make gains across the board. Made out of stainless steal. Comes with titanium tips, and 70mm piping version is available. More info to come.
Invidia N1 Single - $630
Another great system by Invidia. Loud with some drone. Great gains seen mid range and all the way to peak. An affordable favorite with owners. More info to come.
Invidia V4 - $600
This is a fairly new system. 70mm piping diameter. This is the quietest system available from Invidia. If your looking to just get a little more sound from your exhaust then this may be for you. Being 70mm this should perform well, but there is no real information other then this at this time.
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