A good idea would be to combine this with a test pipe for ease of install since most of us have a test pipe anyways.

 

A cut out would have to be tuned like any other mod for best results. Given the resulting compromises I would just get a good 70mm system as earlier stated. Just how would you use this? Flip it open to get on the freeway then close it? So you get called out by a white Jetta, then what, "hold on dude while I open my cutout"? Too late junior...

 

could the dimension allow this to be made into a bolt application if given to some experience weilders to directly replace cat or test pipe???

 

Unless you have a CAT, there is no tuning needed whatsoever. I am stating this based off of actual experience, and not what I think to be true. You cannot compare the gains made by a 70mm, 3" or whatever other size exhaust to a cut-out. There is a night and day difference between the two.

A cut-out is primarily designed for track use.

 

What is this "dimension" you are speaking of?

QTP makes down-pipes with this cut-out in it for Evos. I am not sure if they make it for other cars.

 

sounds really suspicious............

 

Um...how's that?

 

Here is one example of the potential gains from this cut-out:

http://forums.evolutionm.net/showpost.php?...46&postcount=40

Cliff notes: 38awhp and 16 ft-lbs gains

I don't understand why some of you are so skeptical about this mod.

 

not to start a flame war or anything... but its just fishy coz its too good to be true and you're overly defending it mr. op. sorry, i'm out of this thread.

 

Check out the link I posted above. Nothing fishy about this mod. It should be very easy to understand that a car will make more power if the exhaust gases can be vented right after the manifold instead of having to travel all the way through the exhaust piping.