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Diesel exhaust back box on a petrol car. #839484
25th Nov 2013 11:25am
25th Nov 2013 11:25am
Joined: Sep 2011
Posts: 156
Wallasey
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Brown_Horrocks Offline OP
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Wallasey
Hi,
I have a Saab 9-3 with a 2.0 petrol engine, I have been looking round for a replacement back box which has twin tailpipes which exit the box through a cutout in the bumper ( the existing backbox has twin exit pipes which bend down to the road).
I have come across one which is a Saab original part but it is designed for the diesel engine, the physical size and fixings are identical so it will be a direct fit but I wonder what (if anything) would be the problems encountered in using a diesel backbox on a petrol engine? I wasn't aware that there was likely to be any difference between the two.

Thanks

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Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks] #839644
25th Nov 2013 11:39pm
25th Nov 2013 11:39pm
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Dodgy_Bob Offline
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As far as I'm aware (my experience is td & hdi) diesel exhausts have the baffles arranged to allow the gases to exit the exhaust easier as diesels need to breath easier than petrols, whereas the exhaust on petrol engines need to provide a small amount of back pressure to allow the engine run nicely, although it may fit you may find that the reduction in back pressure may cause running issues on a petrol.

Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks] #839675
26th Nov 2013 9:14am
26th Nov 2013 9:14am
Joined: Nov 2003
Posts: 12,002
Wirralshire
StuyMac Offline
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StuyMac  Offline
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It may be a little louder than the std exhaust, but it wont cause you any problems smile


What If There Were No Hypothetical Questions?
Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks] #839681
26th Nov 2013 9:45am
26th Nov 2013 9:45am
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Wallasey
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Brown_Horrocks Offline OP
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Brown_Horrocks  Offline OP
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Thanks for both replies.

I posted this on another forum as well, the concensus seems to be that it is unlikely to have any ill effects so thanks for confirming.

Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks] #839733
26th Nov 2013 3:00pm
26th Nov 2013 3:00pm
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Gibbo Offline
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Gibbo  Offline
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On HonestJohn? I noticed that and was going to copy and past the answers here!

Re: Diesel exhaust back box on a petrol car. [Re: Gibbo] #839781
26th Nov 2013 6:12pm
26th Nov 2013 6:12pm
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Wallasey
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Brown_Horrocks Offline OP
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Brown_Horrocks  Offline OP
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Originally Posted by Gibbo
On HonestJohn? I noticed that and was going to copy and past the answers here!


Yes, that was me


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