because he didn't build it for looks..
That car is so hardcore under the skin... That's my buddy Richie's 240.. It took us forever to get that thing together.. well, "us" is loosely interpreted.. I helped him a good bit, but he definitely did 95% of the work himself, w/o assistance or informational aids.. and tons of ordered parts were wrong; the mount kit was sent incorrectly, twice. The FMIC pipes were wrong, and mismatched. blah blah..
Bottom line, the RM25DET which is totally stock, except FMIC, ehaust, and engine management, made 330-340rwhp on 10psi with the stock T25... crezzeh!