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Does the addition of a backdated exhaust on an '83 US-spec 3.0 more or less equal the overall performance of the higher P/Cs and fuel dizzy differences of the Euro-spec 3.0? In short: if backdating the exhaust yields close to the same horsepower for both motors (200 vs. 204 hp), I'm not so sure there's an advantage of a Euro 3.0 over a US 3.0...
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One set of #'s doesn't tell the full tale of potential performance. Ignoring factors external to the engine a 190hp 2.4S sounds just as potent as a 200hp Carrera 3.0. It's not even close except on a race track where the gap is reduced but never closed. The h/c p/c will increase torque across the board. Since torque at revs is a good indicator of performance and assuming that cis is retained, the most potent combo will use;
- h/c pistons(w/ bigger displacement which isn't that much more $ if you are buing p/c anyway)
- happier cams the 993/964 are reported to work well
- massaged ports
- ssi's
I agree that the euro f/d is probably required(we needed to add one on the last 98mm SC we did, but it may have been just that the old one was on its last legs anyway)