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i guess it will remain a mystery...

can you provide the two dyno sheets for those runs? was the total timing the same for both runs? did you do multiple runs with each configuration to ensure there was no anomaly? was the car colder (i.e. rear end temps, transmission temps, etc) on the non-locked out runs? how much did...

my first welder was a cheap 110V unit i had picked up from TP Tools. The rollers/bearings got really sloppy and the liner was shot. I couldn't find parts. I thought it welded sheet metal better than my Miller MM210. I would speculate a Miller MM252 would be even worse with light gauge metal...

i indicated exhaust length has the largest impact. not the only impact. i installed a straight through Magnaflow on my truck. it had a bad drone around that seemed to peak around 1800 RPM (when up to temperature). I made my own closed end resonator and made it adjustable so I could tune it to...

Drone in my opinion is simply an acoustic oscillation that occurs at a frequency to where the exhaust pulse pressure wave travels down the pipe, hits the atmosphere (end of the tailpipe or another discontinuity) and reflects back. think of a guitar string. there will be a frequency where an...

adding timing will help increase vacuum.

it's probably the flap/valve inside the muffler that's rattling. i can't imagine a second h-pipe would help.

1. Do you have a 351w firing order? 2. Did you overtighten the rockers when adjusting causing the valves to be open?