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Originally Posted by ACT86
Ok, so fitted 5 of the exhaust hangers a day or so ago and have driven it quite extensively since. They made a slight difference, but it was minimal unfortunately. Its an improvement, but I didn’t think it was a resonance problem necessarily, more just the really deep boom that comes out the muffler at low revs. I had my wife drive the car past me and at low revs and minimal acceleration you can literally feel the boom coming out the rear as the car goes past.
Don’t get me wrong, it’s not RIDICULOUSLY loud, but between 2-3k under load or under deceleration it’s just not enjoyable. I have an exhaust on one of my other cars which is probably twice as loud volume wise (no joke), but it’s a ridiculously enjoyable noise. This is just boomy and not a nice sound. It does sound great from 3k onwards and is nice and deep at idle though.
I’m a bit stuck what the next move is. Really wouldn’t consider it to be the aftermarket resonator, but I’ll talk to the local exhaust expert about that. I’ve also contacted Perrin to get their thoughts. My inkling is, although it looks great externally (no rust, no crazy heat marks), the rear muffler has had it or lost it’s packing etc.
I am considering a Catted UEL header as at least this would make the lower noise less constant (ie the rumble might make it more enjoyable to hear). Not sure on this though.
Has anyone else with a perrin 2.5” cat back had this problem? Possibly with age?
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Those hangers made a lot of difference for me. Sorry to hear it didn't work for you. I have the "proper" resonated version though. Mine is paired with PSR UEL catless header and tuned for E85. If you can't cope with the stock header, maybe reconsider... It doesn't cover the exhaust sound, everything goes up a notch. I also have a liner in my car, it helps a bit too for longer trip, under the boot mat:
https://www.carbuilders.com.au/mass-noise-liner. I think the "boominess" is just that exhaust note, you will never get rid of that note. Maybe just go back to the stock exhaust with your headers. Over here, a lot of the guys at the track don't bother with the catback as there is not much gain.