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Old 01-05-2013, 07:13 PM   #11
elsolo
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Quote:
Originally Posted by jdubhack View Post
Stock is 2.5". Most aftermarket (FSWerks, Borla, Magnaflow) are offering 3". They just missed the boat.
Just because that is the most requested size, and therefore very popular, does not mean it is the best performing. Most aftermarket stuff for late models isn't about improving performance as much as aesthetics.

When a shop does good R&D for improved performance, you get people that want something different because they think will perform better, despite the testing and development done.

When I was hotrodding my first BBC, I went through four different cams until I finally listened. Then I got the tiny little cam Alan recommended that wasn't very "high performance" in my mind and went the fastest. Probably should have just taken the advice of the guy that builds BBC race motors and owns a dyno.
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Old 01-06-2013, 08:20 AM   #12
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I spent a lot of time at dynos watching people throw on 3" exhaust on their cars and see horsepower drop in the low range and net slower 1/4 mile times. People need to research this stuff instead of just following the gang which happens alot in the enthusiasts world.
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Old 01-07-2013, 07:18 AM   #13
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Bigger isn't always better and 2.5 might be optimum for that setup.
If a i/tune/n-a modded svt can take 3" i dont see why a turboed st cant...
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Old 01-07-2013, 07:22 AM   #14
kflaig
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If a i/tune/n-a modded svt can take 3" i dont see why a turboed st cant...
What do you mean by "take"?
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Old 01-07-2013, 08:08 AM   #15
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What do you mean by "take"?
Well i havent tried it but hasnt tom and a few others said/gotten good results with a 3"? Dont know about the st, but i have yet to see dynos of 2 1/2 vs. 3" on the same car same day same dyno.

Same was said in the gencoupe world. I did 3" and got a better overall hp/tq curve with a 3" single exit. I guess only time will tell for the st
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Old 02-02-2013, 06:59 PM   #16
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What's the warranty on the downpipe? Lifetime?
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