Do I need to install an "H" pipe in my dual exhaust system?
Flowmaster strongly recommends using a crossover tube, otherwise known as an "H" pipe or balance pipe on all true dual exhaust systems. The crossover pipe equalizes the exhaust pulses and allows the sounds waves to communicate between both banks of the engine. Not only does this usually improve torque in the low to mid rpm range, it also creates a deeper mellower tone both inside and outside of the vehicle and helps eliminate "back-rap" on deceleration.
Is an "X" pipe better than and "H" pipe?
Over the years, Flowmaster has performed extensive testing of all types of crossovers and “X” pipes, and has revealed no substantial benefits of one over the other in street applications. We have experienced that some specialized race applications such as small cubic inch engines and /or restricted (small bore) carburetors, will respond well to the addition of an “X” pipe over an “H” pipe.
95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.