He does know that, he said so.

You obviously missed the back to back dyno charts I showed

We're not saying a test pipe won't make more power, we're saying its negligible. I'm not sure any of them will tell you how much power something will make. Usually the better shops don't tend to bench race. I also wonder why they would recommend a $100 pipe that costs them $10 to make over a $200 pipe that costs them $150 to get, also leaving you with less money to spend at their shop. Thats just good business sense.

We both posted back to back dynos. The fact stands that you have presented 0 hard evidence that a proper, metal substrate low cell cat causes significant power loss. You can call that wasting your time to prove a point, I'll just call it speculation.

We specifically said not the stock cat, not ceramic cats, not high cell count cats, but a properly fitted (to the engine) cat that flows enough to not cause any significant restrictions. Just because it does not pass emissions (which is not an end all be all test of clean air) does not mean that it is not at least helping, if not doing almost the same job as the standard power robbing cat.

Obviously you are right, but in my case I have to breathe the air you are polluting, in your case you get to breathe the air I'm cleaning.

 

Just for fun, here is my dyno from AMS on 1/3/08. I left the runfile names off so as not to give anything away. Lets see who can guess which one is with a cat and which one is without. bonus challenge: the cat-less run was no exhaust after the downpipe, or in other words an exhaust dump...

 

this thread went surprisingly quiet. wonder why?

there you have it, folks... HFC FTW.

 

dont go anything less than a full 3 inch turbo back exhaust.. If you dont have alot of funds pick up an EBAY tbe for less than 300.00 shipped... 3 inch piping is 3 inch piping

 

Screw it. Just unbolt and wire up your down pipe from your turbo and run around like that. Then you'll have all the performance gains of an exhaust dump while maintaining the cheap and eh-ffective stock exhaust! Oh and as for the noise, use the saved money to purchase earplugs!

Seriously, I don't have dynocharts so I'll stay away from that, but IMHO the test pipe feels more responsive. Now there is an audible difference in the exhaust note, especially at WOT, but it certainly isn't deafening, in the car that is.

 

No, HFC for the loss still. It will never make the same exact power as a test pipe. The test pipe will always make more.

AMS testing new EVO X, just adding a test pipe... 15whp gain

https://www.evolutionm.net/forums/sh...72&postcount=1