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NYBladeZ · 09-16-2010, 10:30 PM

Actually it is out of the question. Prior to getting the long tube headers I had test pipes matched with the stock exhaust. Sound wise it was the best decision I made for little $. However on a grateful dynojet I made less than 300whp (296.4). HFC's will yield less power. The stock exhaust is to restrictive, the inlets for the y pipe are ~2in so with tp's or hfc's your still suffocating the exhaust.

I don't know how it is in Pittsburgh but unless you're on the sniffer you won't have a problem. NY uses an OBII, if you aren't throwing any codes, which I won't be then you'll pass. However, if you're dumb enough to go to an anal shop that will put your car up on a lift or crawl under they won't pass you even with hfc's because you "modified" the stock cats.

It's wishful thinking to get 30whp with HFC's and a tune, frankly hfc's don't make a big enough difference where I would even throw down for a tune. You would have to get it retuned again after add more bolt ons ie. intakes, pulleys, headers, etc.

09-16-2010, 10:30 PM	#29 (permalink)
NYBladeZ A True Z Fanatic Join Date: Apr 2009 Location: New York Posts: 2,158 Drives: Lotus Exige S Rep Power: 20	Actually it is out of the question. Prior to getting the long tube headers I had test pipes matched with the stock exhaust. Sound wise it was the best decision I made for little $. However on a grateful dynojet I made less than 300whp (296.4). HFC's will yield less power. The stock exhaust is to restrictive, the inlets for the y pipe are ~2in so with tp's or hfc's your still suffocating the exhaust. I don't know how it is in Pittsburgh but unless you're on the sniffer you won't have a problem. NY uses an OBII, if you aren't throwing any codes, which I won't be then you'll pass. However, if you're dumb enough to go to an anal shop that will put your car up on a lift or crawl under they won't pass you even with hfc's because you "modified" the stock cats. It's wishful thinking to get 30whp with HFC's and a tune, frankly hfc's don't make a big enough difference where I would even throw down for a tune. You would have to get it retuned again after add more bolt ons ie. intakes, pulleys, headers, etc. __________________ 2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling Last edited by NYBladeZ; 09-16-2010 at 10:35 PM.