I have experiance with both stock, accel 8.5mm, and NPC 9.5mm. Out of all of them, I thought my 8.5mm ACCEL worked best.

The stock ones work great too, but there the same cost for some aftermarket 8.5mm colored wires. I personally think aftermarket wires offer an increase in throttle response. THen again, Ive only tested them AFTER my stocks needed replacement, so I cant honeslty say there better than stock.

8.5MM look better, cost the same, and fit inside the wires holders like stock ones do.

9.5mm WILL NOT FIT in your stock wire harness. You will have to remove some plastic in order for them to lay down nicely.

9.5mm offered about the same response that I got from the 8.5mm.

Acura Dealerships will also tell you to ditch the 9.5mm if they see them. I went round and round recently with a misfire problem, they swore was caused by my 9.5mm wires which Im still using, but I'll do 8.5mm next time around. The 9.5mm is nothing but a marketing plow.

Oh... I was told the APC 9.5mm are HIGH resistance which you dont want so Im down with 8.5mm wires. NGK seem to be the best EVER so I have been told.

Also, that dude whom said to use BOSCH plugs needs to be smacked silly. BOSCH plugs SUCK and there GERMEN! Also, the white tips are KNOWN to chip off and end up in a vavle....

CASE AND EXAMPLE.... ME!

Look up my name, check my posts. I went round and round and round about a misfire issue I had. Did EVERYTHING, only to be told I need a vavle job. Upon doing the vavle job, guess what they found? You guessed it, a BOSCH white cap inside...

NEVER BY BOSCH YOU CHEAPO's! Buy NGK or DENSO.

Peace and chicken grease.

Anyone know of Wicked garage in Garden Grove? There doing my rebuild. Going Type R vavles all the way around, cam sprokets, and timming belt.