• Yeah those off the shelf ones that you can buy in the shop are not good, they get very hot.

    Your best bet is some Porsche specific ones, 102dB is pretty punchy.

    It'll be even louder with ITBs, mine with open trumpets, 4-1 manifold, straight pipe with just one silencer was 112dB, with 120dB bangs on overrun....

    Did you have to pay to re-book or were they nice about it?

    Also, they should test your car any day there's a trackday or event on, you don't have to make an appointment.

  • Your best bet is some Porsche specific ones, 102dB is pretty punchy.

    It's almost silent at cruise, barks a bit on start-up but idle is very quiet - it's only at high RPM that it starts to get a bit shouty. 102Db is quite shouty, I admit.

    I've emailed a couple of places about getting Porsche specific ones.

  • Just out of interest, why 5,250rpm?

    All the car's i've built have to go through MSA noise test at scruiteneering, we always struggled with the test protocol and rear engine'd cars specifically.

    They always test at 4500rpm though

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