Re: Backpressure Causing Problem
Rig up a 0-15 PSI gauge in the exhaust system, substitute the divertor valve on the air tube would be good, maybe the O2 sensor location is better, someplace before the single pipe from the Y, or drill & tap the Y for a barb fitting, you can always plug it with a brass pipe plug.
Hard line for the first 1-2 feet due to heat, then run the gauge inside the interior. Road test the car. Start at 30 mph to 70 mph WOT, if gauge registers over 3.5 psi, restrictive exhaust. Also, if you run a vacuum gauge from the intake inside, vacuum gauge will not go to zero for the same reason.
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