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Rossa Stainless Exhaust 
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On the Road

Joined: Tue Jun 17, 2008 9:11 pm
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Post Rossa Stainless Exhaust
Can anybody say if this exhaust is very restrictive (it looks it!)? I've been toying with cutting off the bend on the right hand side and putting the tail pipe on there so the gases just pass through the silencer once. Would there be much of a gain and would it be too loud?
All experiences and opinions very welcome as usual! Thanks :)

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Mon Feb 03, 2014 9:56 pm
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Joined: Wed May 09, 2012 7:27 pm
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Location: Hampshire
GTM: Libra
Post Re: Rossa Stainless Exhaust
Hi The exhaust and silencer looks fine for a standard 1275 engine. If your engine has a different cam or improved gas flowing of the head and revised induction such as Big SU carbs or a DCOE 45, the derestriction will gain very little. Take a look at Maniflows website for their LCB exhaust systems and known free flowing silencers like RC40 for ideas.
I recommend reading David Vizard A series tuning manual on the subject of exhaust sizeing.
Regards PiltV40


Tue Feb 04, 2014 1:25 am
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On the Road

Joined: Tue Jun 17, 2008 9:11 pm
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Post Re: Rossa Stainless Exhaust
Thanks for that. I have a Piper fast road cam already fitted and a set of twin HS4s on the shelf but I'm not sure if I'll fit them or not - if the engine is running OK for a change maybe I should leave well alone for a while.... I've always been suspicious of that severe U bend on the silencer but maybe it's not as bad as it looks. Time to get my copy of Vizard down from the attic again :)

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Tue Feb 04, 2014 9:42 pm
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Joined: Mon Feb 13, 2012 2:55 pm
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Post Re: Rossa Stainless Exhaust
I used the GTM stainless steel system on a 1400cc A+ which showed 113bhp on the rolling road. No sign that the exhaust was restricting output and it kept it reasonably quiet.

Richard

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Fri Feb 07, 2014 1:23 am
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On the Road

Joined: Tue Jun 17, 2008 9:11 pm
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Post Re: Rossa Stainless Exhaust
Cheers, Richard! I'm only expecting about 85bhp (exactly 300 less than my Scooby had :mrgreen: ) so it should be good enough for me.

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Fri Feb 07, 2014 11:27 pm
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