No, I went from 330/350 bhp straight to 470 and the efr makes more power at 2500/3000 revs that the t34 did at any point in the Rev range according to the dyno print plus it spools so much faster. I did swap from l8 to a vipec and a new loom too plus I think MAD mapping helps even though I did have an Ahmed bayjoo chip in the l8.