|
Definately use the NGK TR55's. Changing them is fairly easy. I had my Vette dyno'd with the stock plugs. Then dyno'd with a new company called Pulstar, with their plugs in. Then it was dyno'd with NGK TR55's. The Pulstars picked up like 5-7 hp. The problem was the Pulstars cost $25 a plug and when we put the TR55's in it picked up another 3 hp over the Pulstars.
That means the TR55's over stock plugs at 23,000 miles picked up 8-10 hp and they cost $2 a plug. My guess is you would see an 8-10 hp increase just by changing to any good plug. The stock plugs will last to 100,000, but I wouldn't take them or any plug that far.
|
