What plugs RU running?
Im using Autolite 104's right now but I might step back to a slightly hotter plug to see if theres a difference. TR-55's have always performed great in the past so I might go back to ole reliable. My car is NA btw, no NAWS. 
Trending Topics
Another vote for Autolite 104's. I think 106 is stock heat range, 104 being one colder (for nitrous). Autolites are half the price of NGK's and you can get them at Wal-Mart. NGK's aren't available everywhere,
Originally Posted by quick93transam
believe it or not i run the Bosch +4s. i see a lot of people talk bad about the bosch for our engine but i have had no problems at all. i plan on trying the NGKs next so i have something to compare to.
you are prolly one of the only people i have ever seen that has not had trouble with bosch.
I did run the r44lts for awhile only downside was getting ahold of them.
The Autolite 106 is supposed to be the stock heat range but at least with the iron heads they prove a little too hot this may be due to the different thermal properties of iron vs. aluminum. Many of the iron head guys spraying go to the 103 with the NA guys running the 104.
Platinum offers just one advantage and that is resistance to gap wear there is no performance advantage and as already noted it is BAD for spray or boost. Multiple electrodes are a SALES GIMICK. Spark will take the ONE path of least resistance leaving the other electrodes to get fouled. On another forum I frequent one guys wife as an engineer at GM and one of the projects she had worked on was testing multiple electrode plugs because OEMs would be all over it if it had any genuine advantages. Well she found nothing positive about them and as a result bet you can't find a single car that comes from the dealer with multiple electrode plugs. The side position of the Bosch multiple electrodes might be of some advantage if there were only one as it might allow better flame travel but the 2-4 they put in there negates that possible benifit. Some marine plugs and what my brother runs in his gokart are gapless and he actually did pick up a small amount of laptime like that. Beliee those sorts of plugs foul out fairly quickly though hence their lack of use in automotive engines.
The Autolite 106 is supposed to be the stock heat range but at least with the iron heads they prove a little too hot this may be due to the different thermal properties of iron vs. aluminum. Many of the iron head guys spraying go to the 103 with the NA guys running the 104.
Platinum offers just one advantage and that is resistance to gap wear there is no performance advantage and as already noted it is BAD for spray or boost. Multiple electrodes are a SALES GIMICK. Spark will take the ONE path of least resistance leaving the other electrodes to get fouled. On another forum I frequent one guys wife as an engineer at GM and one of the projects she had worked on was testing multiple electrode plugs because OEMs would be all over it if it had any genuine advantages. Well she found nothing positive about them and as a result bet you can't find a single car that comes from the dealer with multiple electrode plugs. The side position of the Bosch multiple electrodes might be of some advantage if there were only one as it might allow better flame travel but the 2-4 they put in there negates that possible benifit. Some marine plugs and what my brother runs in his gokart are gapless and he actually did pick up a small amount of laptime like that. Beliee those sorts of plugs foul out fairly quickly though hence their lack of use in automotive engines.