spark plug question
 

Probably been awnsered, and i did look.

but im just wondering what to run on my car
87 TII - s5 turbo - street ported - 750 injectors - rb full duel exhaust - more, just little tired cant recall.

which plugs to go
bur7eq - lead
bur9eq - trail

or both bur9eq for trailing and leading. was doing some reading and got a little confused on what would be best.

Read some of the information on the NGK site regarding heat ranges of their plugs and what is meant by cold and hot plugs.
http://www.ngk.com/faqmain.asp

I have recently upgraded my S5 Turbo to something very close to what you mention. I will be going with the standard heat range plugs and will be checking them regularly for fouling or signs of overheating. You can do that as well. Signs of fouling are black or very dark deposits on the inner insulator that surrounds the center electrode. Signs of overheating would be very light deposits in the same area and possibly ablation/melting of the tip of the center electrode. IMO, I think the OEM plugs will work just fine for normal driving, but if you plan on doing a lot of high-rev driving for extended periods, you should probably look at different heat range plugs for both leading and trailing that can take the increased and prolonged temperatures within the combustion areas.

either keep the stock configuration (2 BUR7EQ, 2 BUR9EQ) or if you are concerned about overheating the plugs go with four trailing plugs (BUR9EQ)

I have all 9's and cold starts are a pita.

alright thank you.

one more question on teh wires to run, im lookin at the Racing beat ultra 8mm wires.
and just wondering to go with the "race" or "street" version

We offer ULTRA Ignition Wire sets for both street and race 1986-92 RX-7 applications. Street wire sets combine excellent radio noise suppression with high performance (5k Ohm), while the race provides lower resistance (0k Ohm), with substantial radio interference.

prolly just the street version, but what does the substantial radio interference mean?? what would that do??

stock plugs, street wires. You are not modded enough to need anything more. You could also use a set of NGK wires if you want.

radio interference means it will make noise on your stereo if you listen to the radio, although that is typically more in the AM ranges that no one listens to anyway. There is a small chance that it could also interfere with other electronics.