On my last p38 4.6 I removed center and cats (I had a very good mate that did mots) and under full throttle it sounded like a f-ing tvr cost me a fortune in fuel cos I always had the loud pedal in the carpet!
not done owt to the diesel yet cos the complete exhaust was replaced just before I got it a year ago
 
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On the other hand I had a hole in my exhaust just after the middle box, so basically it wasn't using the back boxes and I didn't really notice any difference in the noise.
Mind you my engine sounds a lot better than his!!!!
 
On the other hand I had a hole in my exhaust just after the middle box, so basically it wasn't using the back boxes and I didn't really notice any difference in the noise.
Mind you my engine sounds a lot better than his!!!!

To be fair hope all ours do ;)
 

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