X-Pipe: Advantage?

[jim_howard_pdx]

I warn everyone not to take too much from a magazine article. Rarely do they do baseline dyno testing, and then change a single item at a time.

If I remove a stock exhaust system that is designed to make maximum torque figures from 1800 to 3600 rpm, and then add a system with larger diameter pipes, no CAT or use a hi-flow-CAT, and then use a hi-flow muffler, then YES YOU CAN EXPECT TO MOVE YOUR TORQUE RANGE UP THE RPM SCALE.

However, if you leave the stock CAT and stock muffler on the car, then the x pipe will deliver about a 10-15 hp difference. It will be at least 2-4 hp more than an H pipe system. It will be quieter than stock, and the HP and torque will be FREE since it is just allowing your engine to pump air at greater volumetric efficiency in its operating range.

You gotta love the magazines. I read one article today that said a fairlane running a 347 stroker and K code cast iron exhaust put out 206 hp on the chassis dyno. A change to Hooker Super Comp headers raised the horsepower to 308 hp.

Now what idiot bolts together a 6,000 dollar free breather, and then chokes it to death with a cast iron exhaust system that cannot deliver even 1 hp per cubic inch. Then they claim the Hooker headers increased the horsepower. THEY DID NOTHING. The K code headers CHOKED OFF 100 HP!!!!!

Now test the Super Comps against FlowTech, Hedman, JBA, or some other good headers and you will see that they add about 8-10 hp more than street style headers. This is good journalism. 100 hp is IDIOCY USING A PEN.