Akai Star

Im picking up an 2.5 exhaust and im wondering if it fit my stock civic cat. currently im running a d16y8 bone stock only intake. the exhaust is custom 2.5 piping. if the exhaust won't fit on my stock d then i'll just wait and turbo it then bolt on the exhaust. any help would be great and i searched couldn't find anything that helped.

esean93

you could get a itr cat

Unseen Racer

yes it fits.
im running 2 1/4 pipping with stock cat

esean93

im sure it doesnt just bolt on.you might need a 2.5' collector.my stock cat couldnt even bolt up to my ls header.

Unseen Racer

i just took my civic to the muffler shop and they did what ever they did to make it work

Akai Star

unseen racer how much was it? the guy told me i need a flange to make it fit. he had it on his type-r build eg coupe.

Vindicator9000

If it's anything like my local redneck muffler shop, they'll charge about $20-30 for a small cut n' weld job. I've had him make minor adjustments to my exhaust several times, and he's never charge me more than $35 for anything.

He charged me $30 to weld on a new cat flange for mine, to give you an idea. Good deal IMO for a 20 minute job.

Redbone

i bolted an 2.5 inch THERMAL R&D system right up to my EX cat. Its the same cat as the Si iust check the part numbers, so it should fit.

Akai Star

does anyone know the stock size of the cat is? i know my stock exhaust is about 2inches but since i dented the pipe and everything i just decided to upgrade instead of wasting money on getting another stock one.

Redbone

what year is your car and is it an EX or is it just a y8 swap?

Unseen Racer

i paid $40 for new 2 1/4' pipe and installation.
have them cut the front and back of the cat (where the flanges are) and then just have the pipe welded on.
thats how mine was done. and its works EXACTLY the same

Akai Star

oh i just got my exhaust for cheap 60 bucks. so im gonna try and bolt it on and if it doesn't fit then im just gonna take it to the shop thanks everyone