i have a hole in my exhust pipe, right above the right rear wheel. it runns along the part of the pipe that is rusted, the line of rust that i see on all civics exhaust pipes. the hole is about an inch long.

i have a 94 civic DX, automatic

 

u may be losing a little bit of low end power due to loss of back-pressure. but u r probably gaining power on the rest of the spectrum b/c of the less restrictive exhaust.

i'm pulling this outta my *** so someone correct me if i'm wrong.

 

you should pickup a LITTLE top end. take off your muffler and you'll pick up even more power...haha...

 

please dont tell him that........ and the power loss/gain from a hole in the rear section will be totally unnoticable (around .05 hp)

 

a whopping whole 1/1000 or a glue factory horse buddy

 

7/8 of 1hp.

 

the back preasure id say is produced just befor the cat..after the cat. exhaust velocity speeds ups producing high end HP..anything interfering with the flow out the back reduce s the speed of exhaust casuing a loss of power..ur not going to lose much..but u do lose some

 

the thing is that i used to have a hole in my muffler. i used one of those quick fix things, but now i loose the cool sound it used to have, and i was wondering how much HP i lost, because i am consifering to put the hole back in there

 

Just tear it all off. Mine snapped right after the cat & I've been driving it like that for a month while I figure out what I want. Less back pressure that way, and it's fun to scare the old people next to you at a light. It's quiet at idle, so sneak up to them in neutral and then blip it to about 6,000. It's great for rolling up on pedestrians, heheh gets 'em everytime. Just give a look like "oops, foot slipped" but make SURE you're not in gear, they'll mess up your windshield.

 

LOL!! ok..that made me laugh muahah!!