Originally Posted by
alleycat
The stock single exhaust is really quite bad. The stock dual exhaust that comes on the dual carb set up is quite good. But virtually any header is way better. Over on jyrki's site he shows what he did for his 320. These are not bad at all and fairly straight forward to build, if you've never done it before. These will diffinatly make power that you will feel. If you want a header that will get all the power there is to get, then you need to build a 180 degree, stepped tube, try-y. Come off the head with 1 1/2" tube about 12" long. Step up to 1 5/8" tubing and merge the two togather someplace handy that all pipes can be grouped togather. Join 1-8, 6-3, 2-7, 5-4.Total lenth should end up about 36''-46'' long. + or - 10'' wont hurt anything, in fact non equal lenth broadens the torque curve. Dump it all into a merge collector of 2 1/2''. Collector lenth of about 28'' will work great. Have fun. alleycat
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