Today I went back to the lake to do a detailed test of the Odonnell Plugs. Most all Normally run MC9`s for High Nitro (cold plug). After Zooming around the lake for a few tanks & got to a fast Rich needle. I came in & took the McCoy 9 out & installed the Odonnell #9. Back on the water to test for speed & back again to compare. Each time I changed props 6.2 6.5 6.7 6.9 60% Nitro on 80/20 oil I went back to the Mccoy 1st then back to the Odonnell #9 & #89 Final Twin test on Roadrunner Twin with RS91`s fully modified, Andy Brown 1667 6.9 props. Also tested a Seaducer 47 Nitro Mono Modified RS101 with X470 7.5 T.E. same test each time I changed props examined the plug condition & changed the Brand. Neither of these test was a little buzzzzz around the pond. Both were with MAX Effort props & Short pipes for High prop speed & High Engine Load. 6 gallons blew thru today testing...... I was trying to find the limits of the OD #9 & #89..... From what I can see..... we will all be running Odonnell #9 or #89`s very very soon...... EXCELLENT PRODUCT! Looks like the #9 & #89`s have dried up @ Tower??? If you SERIOUS about Performance with Max Effort Props & Pipes This is the Glow plug you have been looking for...... If you can find the odonnell #9`s @ LHS you Better SNAP Them Up!!!! #89 are hard to find at most LHS.....