Hey, I was just wondering, how much difference does a set of extractors, like a cheap set from a wreckers or something, have on an otherwise stock (including the rest of the exhaust) 250 x-flow?
You will notice the difference! And if you drive gently and don't enjoy (use) the extra power too much you will get improved fuel economy. The factory manifold is a piece of junk : it is great for scrap metal bin filler.
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