I have a billet LM480, with an LM500 compressor wheel. With 10% meth I get 525bhp and 524 ftlb on a 2.5. Spool is reasonable - in 6th 1 bar is around 3200rpm and full bost but 3600rpm. In 4th it all happens about 400-500rpm later.
If you already have a twinscroll setup the LM-series are a fairly easy upgrade, and results from the LM400 and LM450 are superb...but for higher powers I think the twin-entry approach is a bit of a compromise.
Owen Developments have worked with John Felstead and have an amazing genuine twinscroll that gets John 470 bhp and a stonking 540 ftlb from his 2.1 engine!! Much better spool than mine too.
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