Quote:
Originally Posted by theDreamer
I agree, my order is power/sound/price, but what I hope to see with most exhaust systems is you can get anyone and the difference will be +/-5WHP. Then it just leaves it to sound for me, but I have high hopes most of the time.
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You probably CAN get any one of them and be neck in neck with power output, but the only way to really know is to have an independent 3rd party do 3 baseline dynos, install exhaust #1, do 3 dyno runs, install exhaust #2 and do 3 dyno runs.
As many forum threads have stated, a typical exhuast hp gain on the vq37vhr is less than 10 hp from aftermarket exhaust alone. When a competitor claims 20 hp gain and your product is only showing showing 7 hp gain on your dyno, it gives you a lot of incentive to fudge numbers so that your exhaust setup looks as good as the competition. Its easy to do. You can change the calibration on your dyno, telling it that it is at a different altitude than it really is. You can do your "before" dyno runs during the hot part of the day so the hp on the car is down, you could add a little 100 octane to the tank, you can change how much cold air is directed to the front of the car from fans, etc. If you want the dyno software to print all that info, it can. A lot of tuners don't want it on the dyno printout because then you can figure out where they fudged the numbers.
The only way to compare the Fast Intentions exahaust to Stillen or any other manufacturer accurately is to run it on the same car, on the same dyno, at the same humidity, temperature and barometric pressure. Otherwise the numbers are not truely valid.
Since the above scenario is not likely going to happen, I would buy the exhaust based on sound preference, just knowing that there's not going to be much difference between competitor #1 and #2 in terms of performance.
-Phim