[trykemike]

I just drilled 4 7/32 holes inside the ring 1 inch from centre exhaust outlet equally spaced. My valve clearances are near the top of spec exhaust .004 and intake .0025.

I noticed a little glasspack type sound when down shifting and letting off the gas. Overall a little more sound but different.

The engine seems to rev more freely. I have a tach and have to watch or 8000 rpms comes very fast now.

I need more time before the final verdict.

Sounds more sporty now.

Idle approx 1500 rpm.