But U never stop modding though. I say go for the 255 cos it will work fine with your stock setup and will accomodate many many more mods. It WILL NOT make U run any richer than usual
Also remember technically 155lph will support 400FW HP which equats to ~340RWHP.
BUT under WOT the electrical system is taxed and U do not see 155lph. Actually U will see more like 110lph unless U add the electronic boost a pump.
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Black SN95
TFS heads, Holley intake, AFM B-2 cam,
12.9 @110mph best ET
13.06 @111mph best MPH After gutting out clogged cats and a much better tune. Took Nitrous out for warranty work

didn't have time to put back in for track.