| The POP upgrade refers to a single cone air intake filter, which if it really is "POP" then in was made by Jim Wolf Technologies. I consider that the best single cone filter intake made for our cars. Can't answer your wheel/tire question, but if you're talking about putting 20" reems on your Z, you will get ridiculed here to no end, lol. You need a thick skin on this site. Practically all your questions can be answered by using the Search function on this site. Also, look over the FAQ section. Most of the knowledgeable veterans here will be glad to lend a hand, but they won't spoon feed you. Do you know how much boost pressure you're running? With the JWT ECU, intake and exhaust, you can safely turn up the boost pressure (if not already done) a few psi which will give you a nice "wow" factor.

"Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg
"We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and the benefit trickles down." Robo
"Not everything that can be counted counts. Not everything that counts can be counted." Einstein
"And now my friend, the first-a rule of Italian driving, [Franco rips off his rear-view mirror and throws it out of the car] what's-a behind me is not important." Raul Julia, playing Franco Bertollini while driving a Ferrari Daytona in the movie Gumball Rally
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