I tried doing a search, but couldn't find what i wanted.

my son has put a bigger 22RE in his 87'toy...I read somewhere on here that adding a new exhaust system with bigger diameter pipe helps let the engine flow better...could someone point me where i can find the info
(i thought it said you go to 2 1/4" pipe)

One of the iterations of my exhaust was the LC Engineering header and cat-back. Was nice on the highway and higher RPM, but it didn't do much in the streetable RPM range.
The way it is now:
Stock manifold and downpipe until it merges into one pipe.
That connects to the Cat which is 2" diameter inlet.
Then it's 2" dia until the muffler which is 2.25" dia.
Then it's 2.25" out the back.
Seems to keep the engine happy in the 1500 - 4000 rpm range, about where I keep it for driving.

Todd

Don't go with too large of an exhaust or you will loose back pressure.

I dont mean to hi-jack the post but what about large exhausts and low-end cams? I will be building up my 88 22RE truck this summer and i want to put a low-end cam in it for more poop off idle but i have opened up my exhaust to 2.25" (2.25 cherrybomb turbo and 2.25 after that). I know generally that a smaller exhaust gives better low-end torque but with my kind of exhuast can i still expect nice low-ends gains from a cam?...

TTT

I would think that would depend on what you have bolted to the head.
If it's still the stock manifold and downpipe, you should be good.
Opening up the end only helps get the exhaust gasses out of the way.
It usually doesn't interfere with the back pressure.
If you have a header, things get more complicated to predict.

Todd

Are you saying the stock manifold works better that the LC for "normal" use?

I'm suffering from the cracked downpipe problem. I was thinking to replace with an LC unit, but, maybe I'd be better off getting the old one repaired. Same amount of work.

If you mean "normal use" as daily driver, rpm's in the lower spectrum, I would say yes.
When I had my LC setup (2.25" version) I noticed a bit of a difference on the highway, mainly because I'm running up around the 3k mark. In town, you're spending time in the 1500 to 2500 range. The stock manifold and down pipes work better in that range, IMHO.
Depending on where the down pipe is cracked will depend on how hard/easy it is. I would say it is actually easier to repair because you don't have to mess with all the nuts/bolts that connect the manifold to the EGR system and head, just the three that connect the manifold to the down pipes.
Currently, my exhaust is welded front to back. The only places it bolts up is at the manifold. Less to worry about here in the rust belt, but it will be more expensive to replace parts when that comes time. Oh well.
Hope this helps,

Todd <img src="/forums/images/graemlins/cyclops.gif" alt="" />

i run a engbldr. street rv head w/ 261 cam
LCE header,40 series flowmaster, donwey intake and a few other engine goodies with the AFM 2 clicks richer and it runs great from the low end to the top. (much better than a stock 22re)

a lil sound clip (it was cold so i get a lil belt squeak)

its not my DD so i like it a louder