The rear baffle already has holes in it. I took it out with a hole saw first, beacuse it was easy to reach. Much nicer exhaust sound and a marked improvement on pinking.
The front one demands two extensions on the drill (= one more) and then it all starts to wobble. Approach from the front. It has no holes in it at all, the fumes go "around" it, so to speak.
As a precaution against too much noise I have drilled four 9 mm holes in the front baffle and I am still evaluating. More, throatier exhaust rumble and the manifolds no longer glow red. Almost no pinking.
Not sure I need to use the hole saw and there is room for at least four more 9 mm holes.
Oh, a tip for you: It takes forever to get the bit to bite into the stainless, but using an impact drill made it a doddle. It took seconds to drill a hole, in stead of several minutes.
Last edited by DocNik; 16/01/17 11:57 AM.
