Exhaust setup? - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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Exhaust setup?

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Old 10-21-2002, 06:17 PM
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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?
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Old 10-21-2002, 06:36 PM
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My exhaust setup is some pipe and a couple of mufflers....hope this helps.







Are you just looking to replace the cats, or the whole deal?
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Old 10-21-2002, 06:38 PM
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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 ?
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Old 10-21-2002, 06:41 PM
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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.
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Old 10-21-2002, 06:47 PM
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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?
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Old 10-21-2002, 07:08 PM
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what size piping was stock? seems like a waste to only upgrade to 2"
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Old 10-21-2002, 07:47 PM
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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.
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Old 10-21-2002, 08:02 PM
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if loud doesnt bother you then just take off the whole thing
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Old 10-21-2002, 08:03 PM
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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 ...
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Old 10-21-2002, 08:19 PM
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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.
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