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Do you notice much gains at all? I'm running JCW exhaust and remap @ 259.6 bhp. Thanks
I'm running the JB4 on map 2 which is 6psi over stock. You'll lose low end torque with any catless downpipe but mid range and high end rpm this thing pulls nonstop. 4th gear pull from 60MPH is very linear and it just keeps accelerating very quickly.
 

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Catless?? Are you using an o2 spacer??
Yes I'm running the Milltek catless. The first o2 bung is same height as stock as that one doesn't matter. Second o2 is extended about 2-3 inches out away from the exhaust flow which helps keep it from throwing a CEL. Over 1000 miles so far and A LOT of hard driving and have had no CEL. It could be though since I am running the JB4, it may automatically cancel out the CEL for a downpipe since map 2 is meant to be used with a downpipe.
 
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