[LOAF]

That makes sense..

Like I metioned earlier, I am not at that point with my type IV.. I am somewhat familiar with the supply and demand issue as mentioned.. but how hard can it be to make a header and exhaust.. I ask this as a general question..

I would think the following applies... Getting a good think flange that would seal and mate well with the exhaust manifold, then making a 4-2-1 or 4-1 collector, to mate to a phat boy exhaust.. There are no bellmouth type flanges as seen on newer cars at the exhaust manifold.. so you have both cylinder exhausts ports merging near the exh port.

I know I am over simplifying it, there are scavanging issues, tube sizes, and lengths that effect backpressure.. But I would be curious if a home made product would vary significately to a factor tuned product..I would think using measurements from an existing model, would generate adequate numbers.. How off am I? I know in our cars exhausts make a big difference, so how are people dealing with the exhaust issue.. (buying from the Europe) or grafting a type I type Exhaust and making it work?

Not meant to be disrespectful, but instead looking for answers and a chance to get smart..

ALex