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Originally Posted by Alan l.
Ben,
The gain of 36whp and 29wtq is huge for just swapping to a catless downpipe. Did you ru on a higher boost map as well to achieve this? maybe things have changed since I was modding my N55 but i don't recall a catless dp giving that much of a gain. Also how noticeable is the smell? Is there anything else on the market now that would suppress the catless CEL besides the JB4?
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I didn't change anything but using gas from Chevron instead of Costo in between those 2 runs.
I was surprised too when I saw the gain, but ER said that's about right.
We did 3-4 run on the downpipe part, and every each run, I gain a little more.
The smell is better than the N20/N26 as far I can tell you, because I had catless also on my F10 528 before.
On the N55 seems a little better.
Other than JB4, I can't think off anything that can supress the CEL currently.