bigisletoyota

whats up everyone. I have a '91 3.slow pickup

i have two questions.

1.) I cut off the tail pipe (after muffler) on my toyota pickup exhaust for a little more "noise" and i guess more flow.
will this help or hurt my gas mileage??

2.) anyone have any information on the ISR MOD that i have been hearing so much about???

elripster

ISR: http://www.ultimateyota.com/index.ph...=3819.msg37152

It's unlikely your MPG will change much if you cut the pipe. You might find you have more torque at higher RPM's. You can always get a sleeve from your auto parts store and reattach the pipe if you don't like it.

Frank

aviator

Here's a YotaTech link for the ISR mod: https://www.yotatech.com/forums/f130...4runner-75167/

Cutting the pipe will really only make your truck noisier and also increase the under-body temperatures which may lead to a fire or Carbon Monoxide poisoning. You'd be better off putting a larger diameter exhaust system with a "free-flow" CAT on your truck to get better performance.

dirtoyboy

cutting off the exhaust tip wont do a danged thing except collect gasses under the bed of the truck instead of exiting the side like normal. I cut mine even with the leaf springs exiting out the side..



I wouldnt recommend cutting up your airbox for the "ISR" mod or whatever either.