Exhaust size ?

[PrestonH22]

I have taken my original 1.7Liter flat 4 engine and have rebuilt it into a 2.7 Liter Flat 4 engine. what exhaust diameter size would be best ?

[dr914]

If you do not want heat, use the msds header system, if you do, use the 2.0 heat exchangers

[PrestonH22]

I was looking to run a complete aftermarket Exhaust. I was asking what diameter headers would flow enough air for my engine. 1 5/8 vs 1 3/4 vs 1 7/8...

[Dave at Pelican Parts]

Talk to Tangerine Racing. They make the best 914 exhaust system PERIOD. They'll also know what diameters to use based on your displacement and RPM range.

Make sure you're sitting down when it comes time to discuss price, though.

--DD

[BYprodriver]

Originally Posted by PrestonH22

I was looking to run a complete aftermarket Exhaust. I was asking what diameter headers would flow enough air for my engine. 1 5/8 vs 1 3/4 vs 1 7/8...

I found a Chevy chart for choosing header pipe diameter & just did the math to determine what I wanted for my Porsche.

Smaller = better low rpm torque

Bigger = better high rpm horsepower

You may choose one.

[Emo993]

PrestonH22, is this for race or street. For a stock 2.7L six it still 1.5 inch diameter....I would not go over 1 5/8 unless you engine will be spending most of its life around red line. Best, Mark

[Dave at Pelican Parts]

Emo, he's not talking six-cylinder.

--DD