New Exhaust Droning Bad

[Thomas_D]

Thanks

 

[Thomas_D]

Question:
If they install a different spec/new cat-back will the engine need to be re-tuned?

 

[[paradox]]

no, cat back doesn't greatly affect performance to begin with, its mostly about noise.

even swapping to a completely different full exhaust system (of similar spec) would hardly change the tune parameters

 

[Thomas_D]

Cheers

 

[Not_An_Abba_Fan]

What paradox said.

 

[Thomas_D]

Update.
Changed to a quieter rear muffler, drone is as bad if not worse, regardless of quiet or normal mode (bi-modal). Took my nephew for a drive this afternoon and he agreed it was bad, and he's a revhead.
I won't take it back to the same place as it's obvious they either don't have a fix or are not willing/too busy to invest the time needed to listen to me +road test.
Couple of options I guess, choose another shop who will either replace the catback (2.5inch)or add a H-pipe/J-pipe etc....

My mistake initially was agreeing to a 3 inch system, total overkill for my current setup.
From my end, I can attempt to sound-proof the spare wheel recess etc...
Pondering...

 

[Not_An_Abba_Fan]

Sound proofing won't fix the issue, you will still hear it. As it's harmonic, you also feel it. There is another solution that may work but it's expensive, tunable J pipes. The J part is a slip join and you can adjust the length until it tunes the drone out. That coupled with a H pipe should work.

Cheapest option is to fit a quality 2 1/2" cat back, one with a muffler up front, and try and sell the 3".

 

[Thomas_D]

Sound proofing won't fix the issue, you will still hear it. As it's harmonic, you also feel it. There is another solution that may work but it's expensive, tunable J pipes. The J part is a slip join and you can adjust the length until it tunes the drone out. That coupled with a H pipe should work.

Cheapest option is to fit a quality 2 1/2" cat back, one with a muffler up front, and try and sell the 3".

I think this might be the path to take, lesson learnt.
NAAF would Manta be the pick of the bunch?

 

[Not_An_Abba_Fan]

The Manta 3" wouldn't have droned either, but the 2 1/2" is even better. Sounds good, no drone, but you have to use the whole cat back not just the centre. If you keep your bi-modals then go the "quiet" front, it has a muffler and hotdogs, it is labelled quiet but only to differentiate between the quiet, medium and loud.

 

[LS1SS]

There was a previous post here some where about drone,a member said he eradicated drone by putting a H pipe after the mufflers as well as before them,would like to see this first hand myself,any one else done this mod?