Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,349
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Jun 13, 2012 23:21:22 GMT
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Having just reacquire a new car with a stainless Cat back i need help.
Low revs low speeds its fine.
but 50mph and above its head rattlingly loud.
Are there any solutions too this without buying a new back box, I've already seen removable baffles.
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus - Mercedes W212 E250
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Earplugs?
I have the same problem, I tried a baffle and it made a slight difference but nowhere near enough.
What car is it? Look underneath, see if it's got any boxes bypassed - It's pretty common for the custom exhaust places to just pipe straight up to the back box to save money.
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Don't do more than 50mph, or, start singing louder and louder to drown it out.
Sorry, not very useful I know.
Is the exhaust corroded? Is it just a hole? If the silencer is repackable, that is the only option I know
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,791 
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I had a similar issue with my old 190E
I made a 'centre' box out of an old 'Cherry Bomb'. Took the edge off nicely
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ChasR
RR Helper
motivation
Posts: 10,309
Club RR Member Number: 170
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Quiet down!ChasR
@chasr
Club Retro Rides Member 170
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Jun 14, 2012 10:23:25 GMT
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The Pug 306 GTI6s used to suffer with this with most aftermarkets exhausts, even a number of standard pattern ones. Unless you did over 80mph they would boom at that dual carriageway speed.
Getting a system with a chambered or Baffled back box (the Jetex I fitted to mine had this as did the original but pricey backbox. As Cobblers said, these types of systems are not always the cheapest.
What car is it? On my MkIV XR3i the first time it was down to me fitting a cherry bomb for a rear silencer, the second one I bought had downpipe back system fitted from a carb'd 1.6. Raspy and boomy were not the words
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