Supercharger - problematic with stock exhaust? - LotusTalk - The Lotus Cars Community
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post #1 of 8 (permalink) Old 07-17-2019, 07:11 AM Thread Starter
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Supercharger - problematic with stock exhaust?

I'm looking at a supercharged Elise (presumably VF) and it still has the stock exhaust. I've read through some older threads where there was discussion that said you needed a SC specific exhaust or the supercharger would be inefficient (backpressure, heat etc). The seller (who knows a lot about these cars) said the stock exhaust was fine and was quieter than any of the aftermarket options. I personally am not interested in a loud exhaust but I want to make sure that keeping the stock exhaust won't cause any problems down the road with longevity of any of supercharger or exhaust components. What are your thoughts?
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post #2 of 8 (permalink) Old 07-17-2019, 07:43 AM
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I have BOE Rev300 with stock exhaust and really like it. There is a bit more intake noise and the s/charger whine and sounds terrific; not loud.

One of the BOE guys commented on how pleasant it was to drive.

Also told me that mine was 1st car that came in for S/charger with stock exhaust.

Apparently, didn't lose more than a couple of hp too....

Note that the stock exhaust was pretty free-flowing to get that hp out of such a small engine.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

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post #3 of 8 (permalink) Old 07-17-2019, 07:47 AM
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Many have run stock exhaust setups with their S/C's over the years without issues. Of course it would be better to open it up with a full setup but I see no issue in what you are wanting to do. Especially if your tune is setup for the stock exhaust system....I wouldn't worry. Now if you were to go out and purchase a new exhaust then of course buy one that is recommended for S/Cing.

For me I am just decated with a Larini CS muffler, stock headers. I did this prior to S/Cing but I am positive that it makes little difference to power or longevity as I am just running the canned Sector 111 tune. I just love the sound and the look of the naked rear with above diffuser exit. Now if you are trying to squeeze out all the power you could, I would change it out with headers. But I think you will be just fine.

2005 Elise- Katana II Supercharged and other fun bits
2011 Evora - Daily Driver
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post #4 of 8 (permalink) Old 07-17-2019, 09:29 AM Thread Starter
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Great! Thanks for the input glb and Mobius97, I appreciate it!
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post #5 of 8 (permalink) Old 07-17-2019, 10:25 AM
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I have the vf kit on my car with stock exhaust. Tune is great, sound is great, have done 10k miles with set up and no major issues. Including some solid track days.
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post #6 of 8 (permalink) Old 07-17-2019, 10:40 AM
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This is a damn good site, isn't it?
SS Lotus Elise likes this.

05 elise (BOE Rev300 supercharged, SSRs, shift tower mods, Multivex; HID hi/low beams); 05 Corolla XRS. Past '72 Elan Sprint (I restored), Lotus 7 w/X-flow, TT Supra, Bugeye Sprite, BMW 2002 & 2002tii, '65 GTO.

Driving Tips-https://www.lotustalk.com/forums/f10...art-1-a-49665/
Moss Emergency Line-https://www.lotustalk.com/forums/f10...cy-line-36631/
Bleeding Brakes- https://www.lotustalk.com/forums/f10...-brakes-241138
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post #7 of 8 (permalink) Old 07-17-2019, 11:41 AM
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The site sorta sucks... the people are awesome! I think there is something about owning these cars that makes us want to share the crazy experiences we have and help each other out.
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post #8 of 8 (permalink) Old 07-17-2019, 02:14 PM
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Phil @ Boe recommend that you match up the stock exhaust header at the flange where it meets the cylinder head. It's very easy to do. Take off the header and open the ports to match the exhaust gasket. It will flow better and give you a few more Ponies.


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