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I had an N54 135i (JB4,Charge Pipe and Catless DP's) ran well and now an E89 N54. I put the JB4 in it and had under boost issues. Waiting on AR Catless DP's and the charge pipe to come in. I ordered it with Forge DV's (Suggested by Mike at N54tuning.com) as running a Tial BOV is better if you are running Meth which I won't be. Hopefully the under boost issue will go once I put the aftermarket charge pipe on (based on the plastic stock charge pipe theory)
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