In one of your recent post you stated that you had installed real duel exhaust. I am curious how did you do this legality ? In my state we have a regular inspection we pay $7.00 for and receive a clearance certificate for a clean bill of no defects which we have to have before getting the new years license. On of the items checked is the exhaust. Now according to the federal law that exhaust can not be changed from the engine to the cat. It would be obvious with my truck on its lift to spot a true duel exhaust even with two cat's installed., and any where I would take it they would be forced to give me a reject notice. No new license.
In my younger car building days (before the gov. mandates on cleaner air requirements) it was a standard cost for us to relieve the back pressure of the engine with installing duel exhaust. I know the theory & true benefit. So how did you in your '03 1/2 ton'r get by with it, using the loop hole you found maybe I can use it also.
You don't remove the catalytic converters that's against the law. You just remove the Y pipe so that you have a seperate pipe going all the way back to each of the converters. What they sell on the internet that they call "cat backs" are not really cat backs they just install two pipes from the Y pipe forward with those kits. Meaning that they leave the bottle neck in the system by having two pipes going into one pipe and then back out with two pipes which just defeats the purpose. Hope that helps. At least that's the way the piping is on a Silverado not sure how it is on other models.
No way of getting around having what amounts to a brick in the system with the catalytic converters but they've come a long way with those things today they flow much better than they used to. They make cars today that would blow the doors off of the old muscle cars that are as quiet as my Grandpa's '59 Buick used to be.
2010 Rockwood Signature Ultra Lite 8315BSS
2003 Chevy Silverado 1/2 Ton Extended Cab
Well we had a different definition of a "True duel Exhaust". Did not think my version was legal in all 50. Mine is a single running from the V-8's both sides of the engine's exhaust manifold back bellow the bumper. Straight as possible and when not with a mandrel bend. In those days there was a term called "Lakers" where as there was a Y right as the pipe straighten out from the exhaust manifold. Then on one leg of this Y was a chromed pipe that ran out& turned just below the doors with a bolt on pug at the end. When racing you would un-screw the plugs for a "blank" close flow free exhaust.
When they ran a Factory street version with a 426 Hemi with 433.6 HP and a 472 lb. ft. of torque, which we disagree again on "Blowing the doors off". in all kinds of ways of timing. Do some checking on that , and that was with full steel frames & bodies & again the True Duel Exhaust..
Those lakers were also known as drag pipes where I was raised. Not only for drag racing but also because they'd drag on just about any high spot in the road.
Yeah I know what you're talking about having straight pipes with no restriction being true duals like the ones I had on my '64 Mercury Comet Cyclone back in the mid 60's. But in this case I was referring to what the companies are calling cat backs that are not actually going back to the catalytic converters.
I miss the days of the old muscle cars. I ordered a new '73 454 SD Trans Am that was considered the last of the muscle cars that I wish I still had. I also had a '73 454 Corvette convertible that was pretty much a boat anchor until I rebuilt the engine and bought the engine up to the LS6 specs that was a really great running car. Oh to be young again. I spent a fortune on those things but it sure was fun to go cruising on the weekends.
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