Well it has taken me a while to update this again, but have been busy; so busy in fact that I haven't even had time to get the new backbox decibel tested to be sure that it's quiet enough to get on track for Spa in 2 weeks time. Although I have booked a half day holiday for next Wednesday to get this part done as I literally cannot fit it in any sooner. That being said, the guy at Solid Fabrications (where this was made) had a reader (but he was unsure of the accuracy) and it stated 100dB without the bung he made and 92dB with.
A bit of background; originally I wanted a silencer fitted to my older 70RR but due to the shallow bends on the J's Racing back section this was not possible as the silencer would have been at the wrong angle/ wouldn't have fitted. So, he had to custom fabricate a whole new flangeless backbox to mate up to the b-pipe section of the 70RR. Meaning I now have THREE exhausts! :? Oh well... :lol:
Yes, the car is filthy, and yes, bits are rusty; but who's 9 year old car isn't? :lol:
In terms of the silencer, it was literally the biggest he had available, and it
just fit. Barely 5mm away from the rear skirt on the right side and as close as he could get it to the rear axle (exhaust bends allowing). The pipe before and after the silencer is 3", so 6mm larger than the 70RR, but everything fits etc.
In terms of the sound, it sounds like a raspy OEM exhaust at high RPM, and a little bassier at low revs; which is fine, but completely different to what I'm used to. Time will tell what it turns out like after I've got more miles in with it on.