As Jordan Y. has stated is true there is absolutely no problems running a N/A car without restriction.

There is one thing that is overlooked here, for the most gains possible the power will come from a slightly restrictive exhaust for N/A.

I would have to say not many people or companies can tell you what the proper restriction is for every car or every part of the U.S.
Elevations, Fuel Grade, Engine Effiencies these all play a role. Yes a small role in the search for the very best setup. But then again were searching for the best amount of restriction in the prime location in the exhaust system, for the most power achievable on a N/A car. Then were going to do another mod and screw every single calculation up......


Yes there are Engineers that can do the calculations and use the equipment, to build you the very best system. Give them your car for a month and lots of money, so they can build it. Then again were not all in the search for the greatness of 3-5hp so make sure you have no leaks and atleast 3 feet of pipe past the collector.




Oh and some aftermarket companies rely solely on making all of the scavenging in the header.