Moonshine

Just wondering how many of you knuckleheads are running midpipes with no cat's. Have you dyno'ed before and after? What is the purpose of a catless exhaust system?

I currently have an offroad midpipe. I went to my guy and asked him to tune and dyno my car and he said he wouldn't do it with no cat's. That's not really a problem for me, seeing as though I need to get the car emission tested anyway.

Just wondering how many of you are running off road setups.

school boy

im not running any cats but i havent been on a dyno

MU71L4710N

theres a small difference in power, not much with some of the newer high-flow cats tho. sound changes slightly with cats vs offroad.

im running O/R because florida doesn't have emission laws or vehicle inspections. i'm separating soon and will weld cats in before i go back to TX just so i don't have to mess with constantly changing pipes.

Mustang813

I'm running cat less and mainly doing it because of the sound. Not really looking for bolt-on power from the mid-pipe.

jst98gtmustang

1++ ^^^

trailor

dyno numbers were 233rwhp/272rwtq with just the LTs, O/R h, flowmaster mufflers (40 series i think? dont know, the previous owner installed em) and 75mm TB on dyno dynamics, which is, contrary to some peoples beliefs on here, a dyno that reads less than the mustang dyno. didnt have a comparison to my stock setup tho, so i cant tell you the big difference

03BottleFedGT

i am running no cats mainly because mine were bad when i got the car and it was cheaper to go off road. and i like the sound better

04orngegt

hollowed out cats, have been dynoed and passes emmissons with mils

DreamerGT

You can just leave them out

Im not running any cats because I wanted more hp.

MU71L4710N

thought they checked for cats on the inspections? can't remember tho its been a while.