Thanks for your appreciation popinr33.
"B" and "P", thanks for your feedback on the Kakimoto.
I guess my dilemma is this...
Just a straight swap from the Nismo 3" to the Kakimoto 3.5" gives me this...
If the improvement, was just 3-4Kw, I'd just switch back to the Nismo exhaust which I'm quite happy with - even power-wise.
However, 13.4Kw is an appreciable and noticeable gain; so...
should one consider a Varex rear muffler, or perhaps wait for a 90mm HKS or equivalent.
Pls don't laugh, but I actually bought some ear plugs at the local chemist to-day (for temporary relief of course hehe) > proves I'm not going deaf just yet.