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dan_boy

NA 13B Manifold Pipe Size

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Hey all, I'm currently trying to route the exhaust manifold of my 13B in my Opel Kadett and I just want to know what pipe size does everyone suggest. The standard exhaust is 2" but the exhaust ports on the engine appear to be a little over 2.5" (oval shape). To give free flow, should I use something like 2 3/4" tubing going into 3" or what? Any info/help you can give me lads would be appreciated. Dan.

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Re: NA 13B Manifold Pipe Size Hi Dan, Maybe a bit late for you but if it's any help, any aftermarket headers I've seen for 13b na have been 2"/50mm pipe, at that, they make the car pretty loud even with standard backboxes. Also, 13b in a Kadett? interesting, any more info?

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