Where is the best location for the cutout to be welded in for clearance and maximum performance? thanks guys

 

Mine's in the pipe under the rear seat before it goes over the axle.

 

Right where it looks like it fits perfect. Do a search, you should find more description and probably a few pics. I have some pics in site in sig - might be hard to tell.

 

So would it be worth putting a cutout in because I have stock headers and cats because you probably want the cutout before the cats right?

 

I have stock headers and cats, just get it installed under the rear seat - doesn't need to be before the cats for a few HP increase, and would take a lot of modification to put two cutouts in before the cats since you're stock. Doesn't cost much putting one under the rear seat.

 

What would I be looking at for gains and 1/4 mile time increase?

 

Its a worthwhile mod on stock manifolds/ypipe car. It'll probably add around 10rhwp and knock off a tenth in the quarter.

 

Not really, but the keyword "around" 10rwhp meaning that you can be a little less or a little more then that figure. Obviously, it is going to vary between different cars and applications.

 

Ya but I have factory cats if I put it right after the y will I benefit because of my cats?

 

Did a dyno open and closed when I had after the cats and it yielded 9.1 hp when open.

 

I would like to put one just before the pipe enters the muffler over the rear axle.

Unfortunetly I'm apprehensive about that seeing as how it's soooo close to the plastic fuel tank.

 

Yes, it will still benefit you and it will sound awesome as well.

 

i gained 6 rwhp with it open and thats with running the more free running slp exhaust. the gains would be even more if it was on stock z exhaust. put it after the cat. the gains in performance vs the added cost and difficulty of trying to weld two cutouts on the manifolds isnt worth it. not to mention the noise coming from it would rattle your dash apart.

 

seems like gains before/after are similar from numbers I've seen - if you plan on having it open ALL the time, go after - you'll still see gains, and if you're like me, it's more for the sound anyway

 

Who makes a good cutout not electric I'm hearing flowtech.