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What exactly is the difference in the snout, housing, rotors? I know the series 3 used the drive by wire throttle body, but is that the only difference?

I ask because I have 3 M90's but one was a spare and i'm not sure what engine it came off of. It does look a bit different though, it has a blue steel kind of paint on the whole housing and snout. Would this be a Gen V? I was told It was going to go into a 2003 GP if that helps.

Easiest giveaway is probably the lack of a threaded hole on top of the gen v. Everything is different between the two, but thqts the easies giveaway off thebtop of my head.

Posting photo's of each would be just as easy

GenIII


GenV

I'll have to check when I get home i just remember glancing at it in the dark when i went to get something from the shed the other night and somethin looked different.

They both do the same thing, the Gen V does it more efficiently.

I remember reading somewhere that even a ported Gen III won't touch a Gen V.

What about a ported Gen III with new rotors that have the gen 5 coating ?

MattStrike wrote:What about a ported Gen III with new rotors that have the gen 5 coating ?

I think that makes it a GenV to me, I thought it was the coating.

75mm vs 65-67mm inlet
outlets

These two differences make up a big part in the superior efficiency of the Gen V over Gen III.
Even a fully ported Gen III doesn't match the capabilities of a stock Gen V.

Into perspective, a stock Gen V was 20hp more than a stock Gen III car. Other than the drive by wire, and factory U bend delete, everything else was the same. Typically, stepping down a Gen V to a 3.4 pulley was like running a 3.2 pulley on a Gen III. Its all about improved design, inlet/outlet sizes, and efficiency.

Outlet is way different, inlet is bigger and smoother,also the coating. Quite a lot is different.