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Future REW Swap. Exhaust Compatibility Questions?

Old 09-15-2015, 09:02 AM
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Future REW Swap. Exhaust Compatibility Questions?

So, I bought my RX-8 with the specific purpose to eventually REW swap it in the future. I plan on eventually shooting for 450-500hp, but I'm still doing a lot more research on the swap and what I'll need.

What I'm having trouble finding is, if I do a BHR midpipe and HKS Hi Power catback, will they be large to accommodate the exhaust needs of an REW single turbo or will I have to replace them afterwards? I know I'll likely need a custom downpipe, but I don't want to spend money on an exhaust system I'll have to replace in the future, even if it's going to be a few years before I swap.

Also, if I upgrade the radiator with an aftermarket for the renesis, will I need to replace it or will it need to be changed again to make room for the intercooler and various parts for the REW swap?

Thanks
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Old 09-15-2015, 09:49 AM
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Yes a true 3" from the manifold back will be fine.
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Old 09-15-2015, 01:08 PM
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Originally Posted by 9krpmrx8 View Post
Yes a true 3" from the manifold back will be fine.
Awesome. I figured it would be ok. 3" seems to be the standard, just wanted to be 100% before I start spending money.
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Old 09-15-2015, 11:40 PM
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Originally Posted by projectr13b View Post
Awesome. I figured it would be ok. 3" seems to be the standard, just wanted to be 100% before I start spending money.
The flanges on those are not 3". You could use that as a base and have the flanges redone in say 3" v-band connections. Or if you have the wastegate dumped to atmosphere that would work instead as well.
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Old 09-16-2015, 06:36 AM
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Originally Posted by Arca_ex View Post
The flanges on those are not 3". You could use that as a base and have the flanges redone in say 3" v-band connections. Or if you have the wastegate dumped to atmosphere that would work instead as well.
Cool. V-band would be my preferred way to go anyways. Probably still cheaper to have them modified than to replace them.
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Old 09-21-2015, 04:52 PM
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A 3" exhaust will be fine. I've got the HKS Hi-Flow Catback on my car; it works, is fairly cheap and is pretty noisy (beware of noise limits on trackdays!).

I used an upgraded (3-row aluminium) RX7 FD rad in a location different to the original RX8's rad. I
recommend that you save your money for a rad until you do your swap.
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