I have the ceramic ones on my goat. I'm not sure how much of a power gain I got from them because my first dyno pull was after I had the headers, LPE intake and Magnaflow catback installed. 350 hp/350 tq at the wheels is what I got on the first pull. How much of that was from the headers... I don't know. But regardless, I was pleased with the results because the average rear wheel horsepower and torque that I've seen on stock '05's have been around 330/330. But one thing for sure is you'll save a lot of weight compared to the stock headers.
I really liked the jba shorties when I had my 05 goat, I thought they definately added some power. I dont know exactly how much but I could tell the car had a bit more in it. If you are doing exhaust components a custome x pipe might be a good idea and easy mod for a local muffler shop.
I went with shorties because I was in california if emissions wasnt an issue I would of gotten long tubes.
You just can't beat the cost! Most headers for the GTO are $800-$1200. But I dono't wanna buy em if there is not (at least) a noticable power gain.
Excellent point.........why bother with a shortie if gain is minimal, (which it is). Bite the bullet and get a good set of Kooks LT's. I have learned throughout the years of drag racing that it pays to do it right the first time. Don't be penny wise and dollar foolish. Save $$$$$ for the LT's
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