996 Turbo / GT2Turbo discussion on previous model 2000-2004 Porsche 911 Twin Turbo and 911 GT2. Sponsored By Vivid Racing
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HP is different between various manufacturers. Is the rest of your motor stock and do you intend to leave it that way? Are you running K16 or K24? 100 cell or 200 cell cats?
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03 996TTX50 Coupe Black
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In loving memory of my bank account
95 993 RS look Couple Black
85 911 Coupe Guards Red
83 911 Cab Artic White
80 911 Coupe Met Black
78 911 Coupe Cashmere
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(notice no new cars between 85-95 that's was being married does to you)
this is not a NA car exhaust should not be considered crucial for power level or motor size. smaller is not better in any way.
less restriction the better the only negative thing u get with bigger is a bit more noise.
get a X design or cross flow for sure unless u want a specific sound or brand.
2.75 no less u would not gain anything by going smaller but less noise in some situations by going smaller and you will spool slower more restriction. bigger is best in this case
going not big enough will slow you down at certain power levels though.
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Last edited by OS Inspector; 10-31-2009 at 03:26 AM.
Reason: late night post didn't sound right
this is not a NA car exhaust should not be considered crucial for power level or motor size. smaller is not better in any way.
less restriction the better the only negative thing u get with bigger is a bit more noise.
get a X design or cross flow for sure unless u want a specific sound or brand.
2.75 no less u would not gain anything by going smaller but less noise in some situations by going smaller and you will spool slower more restriction. bigger is best in this case
going not big enough will slow you down at certain power levels though.
will you say 2.75 diameter will be good for 500hp and good through the 600 mark?
most definately shouldn't hold u back but 3" isn't much more alot depends on what u want sound loud/quiet drone/none or performance?
3" should spool faster but 2.75 is adequate for that power level for sure
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100 cells versus 200cells i believe the 100cell flows best.
an x type design tends be slightly quieter then just straight through.
all the brands have a quiet version for the most part
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If you plan to go to 600hp+, go with the 3". Xflows systems are considered better for high HP cars and sound richer. EP and RUF are quite as their designs are based on the stock system. However they are both as heavy as the stock system while most other systems will save you 20-30lbs. 100 cell cats are less restrictive and usually don't throw CELs. However in Cal, you might need 200 cell cats to get by smog. (Technically changing the cats out in Cal is illegal but if you pass the test, most shops will give you a cert.) Prices range from a low of 2k to 8K so keep your overall modification budget in mind. A suggestion is go listen to and if you lucky ride in a few cars with different systems. You're in the Bay Area so you have several good shops to go to including Sharkwerks (a board sponsor). Or take a ride to Santana Row for the weekend car gathering.
__________________
03 996TTX50 Coupe Black
05 AMG C55 Silver
06 X3 Silver
In loving memory of my bank account
95 993 RS look Couple Black
85 911 Coupe Guards Red
83 911 Cab Artic White
80 911 Coupe Met Black
78 911 Coupe Cashmere
99 AMG C43 Black
97 M3 4dr Silver
95 325i Black
85 318i Black
(notice no new cars between 85-95 that's was being married does to you)
some good suggestions Markski's, JIC titanium, Switzer, EP, TUBI, Speed tech has some nice stuff also i have a fabspeed its not quiet though
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Try to get one that ties the two sides together - it will hopefully drone less. You should really be concerned about drone IMO. Nothing is worse than driving along at just the right RPM and feeling like someone is beating on your head like a tom tom! I'd echo what other's have said about trying for a test drive from someone. I have 100cells in my car and the rear O2s are supposedly turned off - no CEL and the plug-in emissions test passes fine...
Try to get one that ties the two sides together - it will hopefully drone less. You should really be concerned about drone IMO. Nothing is worse than driving along at just the right RPM and feeling like someone is beating on your head like a tom tom!
This is so true. With increased size comes increased volume and drone. I have access to and have used all 3 sizes mentioned above and have personally settled on our 2.5 cross-flow for the following reasons:
1) The cross-flow design has a unique, exotic sound that is just fantastic to hear
2) Our 2.5 crossflow system sounds as good as our 3" system (just a little quieter on the outside) and is plenty loud compared to stock.
3) Our 2.5 cross-flow is virtually drone free and maintains cabin comfort vs. a 3", for which the same can not be said.
4) With our 100 cell Hi-flow cats, turbo spool is light years ahead of stock and 200 cell cat designs (even when 200 cell has larger piping).
5) Bypass pipes are easily swapped for performance events/races, which creates a full 3" RACE system when muffler is bypassed.
6) Overall, the best mix of all worlds - from daily driver comfort to full 3" race, all in one system.
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John D (also post as John D, member since 2003)
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Last edited by John@SpeedTech; 11-03-2009 at 09:22 PM.
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