the let can make serious power...by changing the internals for cosworth items. been done time and time again, but its NOT a motorsport engine, it doesnt have what it takes or the history to make it successful.
the XE was plonked straight into the formula vauxhall single seaters almost as soon as it was introduced and that set it off as a contender, and a contender as a standard engine at that. then it had rally and touring car success on top of that.
let is crap and can just about take 280bhp which is dire, but thats about all it was ever produced for...the xe on the other hand was the same engine and therefore can handle the same. now 150 to 280 is some serious tuning, 204 to 280 isnt.
hope i have mentionned that the let isnt a race engine.