For anyone who may be interested, Greg Dupree's new inconel manifolds are truly a milestone in terms of technology for the Zcar and completely changes the landscape as to performance! I was the first person to get a set of these after they went into production and along with my Sport 500's and the usual upgrades I have one hell of a street car. I haven't dynoed the car because dyno numbers and drag slips weren't my goals for the car, I just wanted an awsome street car. Greg tuned my car on a wide band, 100 octane, 15 degrees of timing and 25 lbs. of boost...the car is simply awsome! Greg says the car is well into the 500 hp rangewheels, but more importantly the car makes power OFF-IDLE all the way to redline...no lag fellas! These manifolds give you the best of both worlds, zero lag and a hard pulling car (that now needs drag radials) all the way to redline. It is so much fun running away from supercharged V8's and big blocks from a dead stop and pulling 5 car lengths on them! Evereything we thought we knew about turbos and upgrade/stage charts has changed for this car. Not only was it money well spent, but it makes me grin like a 3 year old everytime I get in it. If any of you are interested in knowing more you can email me FASBLCK@hotmail.com.