when u get rid of/gut your cat or get rid of your muffler, you lose alota back pressure and that results in low end torque, but u make more horsepower higher in the rpm range, my friend had a system like that on his camaro, did it more for the sound though

 

Wont the turbo make some back pressure? could you put a smaller pipe in for the cat and still get the freeflow but have a little more back pressure?

 

what type of muffler do you have and did you gain or lose power after gutting your cat, and is it ok to breath that smell because thats the only thing I'm worried about I don't want to die from exhuast

 

LOL death from exhuast would really suck, im with 04a4 i love the smell of fuel

 

Get a Labree test pipe, they go for ~150-200. I just installed one, it is deffinately the best part of my exhaust system. I reach full boost in 2nd gear ~2800-2900rpms. Compared with the CAT on ~3400rpms. To get rid of the CEL get a spark plug non fowler and put that on the secondary O2 sensor. You have to drill it out so the head of the O2 sensor can fit in so it can thread onto it. I dont have a CEL but this always doesn't work for everybody. HFC's arent really worth the money. If you do think about one techtonics tuning has good prices on they're HFC's.

 

any idea where to purchase this labree test pipe

 

never mind I found it
thanks

 

Were did you find it and for how much money

 

I found it at www.tantrumwerks.com they had it for like 250 or 210 bucks or something like that

 

Love the smell to. On the subject of backpressure, any pressure in the exhaust that the engine has to work to expell takes power. now this is where it gets confusing, the backpressure that most people talk about is acutally the lack of syphoning. With each exhaust pulse that the engine produces, it leaves in its wake a void or vacume, when you go to a biger pipe size, the volocity of the expelled exhaust gas doesn't creat such a draw for the following exhaust pulse, there by leaving a small about of exhaust in the combustion chamber and also making it so that the piston has to work just a little more to expell that last bit out. I really could keep going but I don't feel like it. Anyway hope this helps answer any Q you may have.