X-pipe gains???

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I thought that by getting rid of 2 of the cats it would free up more HP. Is it safe to say the cats in the x-pipe are still restrictive as the stock cats even though they are hi-flow??? So the X is more for sound the HP gains.??
 
the highflow cats are still more restrictive then no cats but in everything i have read they make close to no cats if u factor in the pollution aspect. i run a off road h-pipe. more torque less HP then the x-pipe
 
I don't have the numbers but can you that after I did the headswap I added the MagnaFlow catted X and cat-back at the same time. There was a noticible difference especially in the upper rpms and 4th gear. I'd guess it had to be 15rwhp or more. Don't forget I had the factory 6 cat h-pipe.
 
the offroad pipe makes you lose low-end power because there is too much surface area for the gasses to flow over so they cool as they leave your system, thus causing some gas pressure buildup. The bassani catted aluminized X is a good route because you pass emissions, get the good sound, plus 10-15 hp over the stock H pipe. I got mine for $375, and i think the magnaflow O/R X pipe was almost the same price. Its all preference tho
 
Gained about 6 inches on my 1-2 shift patch with the OR X.

Thats with the 275 Kumhos, probably would have been more on those rock pizza cutters of stock meats though. :rolleyes:

Noticeable improvement, not sure I would count anywhere near 20rwhp with a catted x, even with the catback though.