I think he doesnt know much about cars, there isnt a 140 option, I bet its a 160 or a 180, which there is no need to run them. If the 160 is in there its far too cold for the car, mpgs suffer and car never reaches proper temps on the inside.
Measure the pulley with a ruler or a digital or non digital caliper. I bet its a 3.5 or 3.4, but either way it should come off unless you plan on running more exhaust mods very soon.
The stock manifolds cant handle the extra air being brought in by the smaller pulley and causes alot more stress on the engine, pistons etc etc and can make a piston chip and your out a motor. I would swap it back to a stock pulley.
