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The research done by others in the past came up with results to build 36" primaires for the headers... Considering the brute size of these means a lot of tubing and a lot of space is needed...
I have built two sets of headers. Both using 1 3/4" tubing for the primaries. first set was equal length give or take 3/4" collecting into a 3-1 10" collector out to a dual 2.5" exhaust. Granted these exhaust systems were made with using the stage 3 in mind so thats why they were so big...
Personally, I believe 2.25" duals might be too large for a N/A engine. 2" pipes would be better fitted to reduce turbulance down the system and to maintain a higher velocity. BUT 2.25" shouldn't be too much of a damper and will leave open some room for further modifications in the future.
Ideally a N/A header should be 1.25-1.5" primaries 30-36" in length. The bigger (longer) the collector the better. True duals also will make a lot of noise. I have done it and never liked to sound (tone) so I used a single flowmaster 40 series as an H pipe with 4 magnaflow resonators to make probably the best sounding SVX I have ever heard...
Good luck with the system and let us know how it turns out
Tom
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