Quote:
Originally Posted by Tiago@VRSF
You're really sacrificing a ton of power without a tune but you can install a catless downpipe on a N55 without a tune or check engine light now that there is an o2 fix. I'd just get a flash tune that deletes your CEL.
If you're worried about the exact map required for flash tuning, a piggyback like the JB4 is a good alternative.
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How about the catted N55 DP? How much of a hp/trq gain with that one in comparison to catless (not sure if the 25-30hp claimed on your site are catless or catted, and what tune)? And would that one fit without problems on an xi? Also, not quite sure but this is just the pre-cat in the DP and there's a secondary one further downstream, or not? No CEL (fix needed) with catted DP I guess?
Thx