hmm I thought the tr55s where stock heat range. ZZP "The TR55 is recommended for GTs. It can be used on near stock GTPs but we recommend a colder plug for boosted applications."

Anyway back on topic I don't want to shift the focus of someones elses thread

Ed

NGK V-Power plugs aren't offered in a stock heatrange. That'* why ZZP suggests them for the GT in TR55 'one colder' format. TR55'* work great in L36'* on this forum.

What would your guys recommend for his car? TR6s? Seems like you would? That might remove his small amount of KR.

Stock pulley? TR6'* will foul very fast. Stock pulley'd cars should run stock plugs. One step down in pulley, one step down in heatrange.

Don't fix KR with plugs. Find the REAL cause and fix it. Spark Plugs aren't band-aids.

he has a 3.4 inch pulley, i think his stock one was 3.8

He should be fine with TR-55'* then.

These guys are talking so much about each other'* cars, it'* hard to remember which damn car they're talking about.

he has the tr55'* and has some knock retard? are colder plugs going to fix the knock retard?

It'* possible the TR55'* may kill some, but we're not even into the hottest month of summer yet. That spells trouble down the road.

That car would likely be better off with a 3.5" pulley. So ultimately, it'* probably that, or ported exhaust manifolds or something similar to solve the problem.

Most likely PEMs, I would geues. He'* got a gutted cat, high flow muffler, CAI, TR55s, 3.4", 180* stat. NO computer because the LSS isn't popular enough.

I would guess there shouldn't be any KR, but what do I know? It'* got 2-4*. What do you think?

That'* his '97 LSS I'm talking about, too. Not my car.