OK i have slp shorty headers and the Y pipe that is slp, i just bought an american thunder 3" catback from flowmaster. my question is how do i fill the space and connect the two sections? is there a part number on a I pipe that with bolt right in? my y pipe has a 3bolt flange on it, and so will the catback portion.

that section thats missing is probably where the cat convertor goes

You are correct, but he still will need the slip fit connecter from SLP. I know because I have them on my car.

He already has it...

I know about that too, I have SLPs as well. But I used one of the other flanges besides that 3-bolt one.

yea i have the slip fit flange on there. in fact the previous owner welded it in place for me, theres a three bolt flange on there though. i deffinatley wanna run a straight pipe. is there a direct bolt in piece that anyone makes?

search for a "camaro test pipe" on ebay it might be cheaper to hit your local exhaust shop though.

i gotta flowmaster and im thinkin bout getting the slp headers and im considering running straight pipes so let me know if u find something

Just remember if you live a state with Emission Checks your car will fail without the Cat. Now I know someone will pipe in with "we have no ficken emissions where I live".
Well not today, but the Federal government will mandate them in the future for all states.

hey specvgini...when u installed ur flowmaster american thunder exhaust..did u have to cut it any pipes from the kit at all?

i just have the rear section on right now cause i'm still working on the car, but you deffinately should not need to cut the pipes that come with the kit. i think for now i'm gonna use a two chamber 3" muffler i have in place of the converter.