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Originally Posted by eslai
I have raced many cars on real tracks and yes, what you say is true--for a race car.
On the street, simply removing the secondary cats is not going to make a car significantly faster. In my experience any increase under ten horsepower in a car that weighs a ton-and-a-half is not significant even to the butt dyno.
Now, if you replace the entire exhaust system and tune the ECU, sure you can get some noticeable gains, but that's not what we're talking about here and even so, I can't believe you're doing Mod Math. 
Anyone chasing single-digit HP increases on a street car should really just learn how to drive better. You can't even accurately measure such small gains on a dyno--it's all within statistical error. |
See this is where you almost had it. You were sooooo close....
You said, if you tune the ecu and do the entire exhaust system. Well this is all part of that entire exhaust system. Generally most people don't do all the mods at once, but as they can afford it.
Yes he may not feel the cats on the street (however for 8hp I think you would) but with the headers and cat bypass, and muffler and intake and chip after all these are done you would feel a different for sure.
It would be much more noticable if you did it all at once as you pointed out, for sure I agree with you there. Slap on 20hp worth of mods all at once you will know, but then you don't really know what made the best difference and dont get to feel each mod as you do it either.
In this case, better driving wont help you as were talking about straight line acceleration on the street, so basically while your already moving and standing on the gas. That takes not driving skill, however with a few extra mods you will notice that acceleration gain.
At the track you can physically measure lower time around a lap, but many guys don't make it to the track and just want more wooosh feeling during hard acceleration in a straight line. (Wrong car really buy a Z06 for that) but we all want what we want. For 986silverbullet that is what he's looking for, and he will get it with those mods if he completes them all.
Honestly your posts telling him not to mod the car in a thread asking about doing a particular mod really are not helping.. If you have some positive information to add here please by all means. Simply saying "you wont feel 8hp in the butt dyno" is not helping him.
Regards,