Quote:
Originally Posted by IMS-340C
My advice to you never compare totally different cars with different brands from different eras, if your friend's car has a restrictive exhaust doesn't mean all the cars in the world has a restrictive exhaust.
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Agreed, and to carry that forward, don't assume your car will match anyone else's either. If you think of NASCAR racing, every engine is balanced and blueprinted. Basically clones of each other that perform identically.
On a production car, this is not true. They will all have slightly difference compression, slightly different flows, slightly different timing, etc. All of that impacts the power delivery.
The more cylinders the engine has the more this starts to get averaged out, and is very apparently when you are down in the 1-2 cylinder range.
And I wouldn't compare Saab to BMW as an apples to apples. There has been dyno tests (many of them) that shows upgrading our exhaust is mainly for sound, with very little gains (IE low change in backpressure).