dallasbean

I deleted my silencers and the oem muffler. I was thinking about putting a 2.25 pipe staight from the cats to the mufflers. But i have been looking at videos on youtube and some of them say you can loose torque. Is that true, how about if i do a y or h pipe? will that help? What do ya think?

Dattt

when doing a straight pipe in removing the cats you are losing back pressure so i believe you lose a bit of low end torque yet you gain more higher end

dallasbean

What would you suggest to try to keep the low end and yet getting a good sound. H pipe or Y pipe? Oh, im planing in keeping the primary cats.

slvrboolet

add a turbo...lol

NAiL05

1. If you just gutted cats it can screw with your exhaust flow which = decrease in power.

2. If you have and obd2 vehicle without a o2 sim of some sort you are losing power.

3. If your obd1 as long as you run straight piping it would be the problem is that it doesnt sound as good.

Either way you wont notice much if you dont have many mods on your car.

dallasbean

what is obd1 or 2. My o2 sencors are located before the cat,, i think.

NAiL05

Anything before 1996 is obd1.

dallasbean

Yea, its a 92

dallasbean

If you pay for the mods ill add a turbo..lol

dallasbean

that would be nice!!

JeffTsai

iTrader: (1)

Backpressure gaining/losing power is all a misconception. What you want is exhaust velocity. Sizing piping bigger or smaller will affect how fast the exhaust gas flows out of the car. A small pipe will flow the gas faster because the engine has to force air out at a high velocity. Too small a pipe, then you start to choke the engine. It also depends on the rev range you want to gain power in.

At lower revs, a smaller pipe will be optimal in allowing maximum exhaust flow velocity. However if you spend more time up at higher RPMs, then you will want a bigger pipe because a exhaust diameter that works well at lower rpm will become a choking point at higher rpms. At the same time that bigger pipe will slow the exhaust velocity of the exhaust at lower range so that's why you lose some power down low. That's why when you see aftermarket exhaust systems with dyno showing that it gains max power, if you examine the dyno chart it will often trade low end for top end power. Put whatever exhaust on that the car is meant for, if its just a daily driver then keep the diameter smaller. If you're planning to go high performance or race a lot then go with a bigger piping.

Of course the actual workings and engineering details are much more complicated that (resonance, exhaust pulses, collectors, merges, etc), this is the basics and easiest way to understand it.

dallasbean

Thank you very, very much for that explanation. Now i understand and because of this i may still use the same diamater, but changing it into a H pipe. Gracias!