New Exhaust Power #'s?????

SHAGwagn

Member
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'07 Mazdaspeed 3 GT
Ok im running the Hiboost kit at 8lbs with a stock exhaust system. I was tinkering with the thought of gettin a complete DP-back catless exhaust system before Juan comes down to tune the car. How much of an increase do you guys think I'll see from this mod?

>> 2.5 str8 back with no cats and my HKS muffler?
 
Don't know about numbers, but a free flowing exhaust is exactly what the turbo likes and will make more power, due to less backpressure.
 
thats what i got though i have one cat...i noticed a decent difference. i dont know about the hiboost, but it helped me out for sure. i still kept the angle on the HKS though :)
 
Im plannin on keepin the angle for sure...matt did you go 2.5? How much do you think you gained?
 
Our car gained 16 WHP when we went from stock to the 2.25 Bosal (which I personally like). With 2.5 at least 20WHP can be gained.

If you can, do it before I tune it.
 

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That is awsome news!!! Im working on getting the new exhaust on my MSP, I just got the 3"DP from Apex. I will be getting the 3" Greddy exhaust for the cars as well, Im wondering what kinds of gains this will have. Alot of people have been saying its a better increase than the FMIC. Ill have to note the changes when I take the car to the dyno next week.
 

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