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#839484 - 25th Nov 2013 11:25am Diesel exhaust back box on a petrol car.
Brown_Horrocks Offline
Enthusiast

Registered: 6th Sep 2011
Posts: 149
Loc: 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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#839644 - 25th Nov 2013 11:39pm Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks]
Dodgy_Bob Offline
Member

Registered: 15th Nov 2010
Posts: 51
Loc: Wallasey
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.

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#839675 - 26th Nov 2013 9:14am Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks]
StuyMac Offline

Wiki Master

Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
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?

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#839681 - 26th Nov 2013 9:45am Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks]
Brown_Horrocks Offline
Enthusiast

Registered: 6th Sep 2011
Posts: 149
Loc: Wallasey
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.

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#839733 - 26th Nov 2013 3:00pm Re: Diesel exhaust back box on a petrol car. [Re: Brown_Horrocks]
Gibbo Offline
Forum Addict

Registered: 27th Dec 2010
Posts: 1833
Loc: Oxton
On HonestJohn? I noticed that and was going to copy and past the answers here!

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#839781 - 26th Nov 2013 6:12pm Re: Diesel exhaust back box on a petrol car. [Re: Gibbo]
Brown_Horrocks Offline
Enthusiast

Registered: 6th Sep 2011
Posts: 149
Loc: Wallasey
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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