Anyone have a dyno sheet for NA with straight pipe (from manifold to cat back)? I just want to see what the difference is between straight piped cars and cars with cats

 

While it isn't a exactly a straight pipe, it is close and there are no cats. RB headers and Midpipe, HKS catback.



Carl

 

thx, good curve, now i need to see one with a high flow cat and one with dp and midpipe so i can see waht works best.

thanks

 

My butt dyno said around 5HP increase. No low-end torque loss, and it revved quicker to redline.

 

I'm trying to get exhaust for my 1991 Convert. and i was thinking about gettin either Apex-i (two of them) or something called Tanobi (cant spell it) but, i was wondering how much hp i would increase me and would i loose low end torque ? and what exactly should i get or not get in your opinion.... help please...

 

That does look like a large increase in power... how much exactly can you get out of cat back ?

 

Well, you also need to understand, the exhaust is not the only modifications. That is my current setup which includes K&N air filter, 89 intake, 6port sleeves removed, RB headers, RB midpipe, HKS catback, and a few other misc stuff. If I remember correctly, when I added the Headers and midpipe, it basically pushed my hp and torque curves north but about 10HP across the range and about 6lbs. of torque across the range. I think peak power went from 124hp to 137hp @7000 and I can't remember torque.

Don't just base your numbers off my car. Everything I have done will not work for every car, my current chart shows the results of pretty much all the bolt-on modifications and tweaking one can do to a N/A rotary.

Carl

 

I don't know, 5 rwhp. You gain alot more by removing your cats than anything.

 

Mufflers only give you noise.

 

Ya pretty much, but I do think you gain some by changing to higher-flow ones from stock.

 

Probably, but nothing i felt on my ***

 

What furthur mods did you do to bump the curve up from 137hp to ~150hp? TB mod, CAI, ported manifold, dynomax ultra flow?