Well.. since I know it'll be hard to convince a muffler shop to weild me a 2" piping.... any other ideas to get rid of the cats, or try to get someone to make me a 2" piping?



I'm trying to look for something cheap, but good. Since rotaries do not like cats, and will eat them up quickly, I just want to get rid of the cats. That, or hollow them out sometime soon.



Any suggestions?

My exhaust setup is some pipe and a couple of mufflers....hope this helps.

https://www.nopistons.com/forums/pub...#>/biggrin.png





Are you just looking to replace the cats, or the whole deal?

Probably the whole deal...but I dunno how I'm going to do it, if I can't even get a straight pipe from the exhaust shop.



What sort of pipe and mufflers do you have anyway ? https://www.nopistons.com/forums/pub...IR#>/smile.png

I don't know what's on there...I was told it's the original RB system, but there's no stamp. It's a 2.5" MP and DP into a 2" dual with nice stock looking tips, and it's LOUD.



One thing you can try with the front pipes is you can take off your cat and precat, bring them to a race or exhaust shop, tell them that you're building a race car and you need straight pipe with those flanges and in that shape.

Do you think that'll work? I mean.. taking the pre and main cat(s) off and giving it to them for the right piping size, etc?



If it does, and I get it in that size, it'll just replace everything so I wouldn't need cats at all correct? (making sure of myself here...)



I know your setup is different because you've got a TII, but I was only curious.



I was thinking tho.. if I can get them to get me the straight pipe, would getting a header be a good idea? I know it'll be loud, that doesn't bother me.... but curious on what you guys would think?

what size piping was stock? seems like a waste to only upgrade to 2"

Really don't need a big of a piping on a n/a though.. bigger piping for a n/a won't give a siginficant change, or to my knowledge. I'm not sure about the stock size.

if loud doesnt bother you then just take off the whole thing

well.. I'm gonna take off the cats once I can find someone to make me a straight pipe.. having no cats on a car, and able to drive it on the street legal ... is and will be hard ...

Do not go to a Muffler shop they are morons that will tell you that its illegal and they aren't taking a fall for you.



Go to some mechanic that dabbles in racing. Tell him you are Autocrossing the car and need a temporary straight pipe you can put on for races. If you word it right you will not get any static. If you cannot find someone to do it tell me I might be able to get a few made and sell them for a really cheap price.