Back in the early 70's German engineers used to laugh at American cylinder heads and combustion chambers. Far superior to most US engines.

A 275 cubic inch Mercedes engine should easily put out 225 to 250 HP if the intake and exhausts not strangled. No hot rodder ever said I think "I will put an 1.75 inch exhaust system on my 283 Chevy or Ford 289". Minimum would be 2 inch and 2.25 or 2.5 would be used if cat converters were required.

The stock intake can be opened up, I have never opened one up though. Supposedly the " throttle body can be opened up from a stock 65mm to 70mm. This is a 16.5% increase in flow area".

Anyone know who does this work?