Quote:
Originally Posted by mrennie
Sorry to be off topic. Your wheel ramps, they do not appear to have a brace on either side to prevent them from spreading apart.
I had a set just like those when I was 18, but they had the brace. One day while I had my 72 Lemans on them one collapsed. I had just got out from under the car to go get a different tool, and I am sure I would have been dead had I been under it.
Not trying to be a PITA but wanted to point this out.
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While the subject is side tracked, here's another faulty designed piece of garage equipment that has not been made for ages, but is still hanging around in some peoples garages.
I had a pair of these under a stripped out 69 GP (actually it was my stock car pictured in my signature photos). The car was gutted awaiting me to start on the roll cage. I had a pair of these under the rear frame rails. I left one night after working on the car in the evening after I had closed the garage. The next morning I came in to work to find a collapsed jack stand, and the car lying on the ground. If you have these stands, destroy them so no one can use them, and throw them away:
They weren't even supporting 1000 lbs, and they failed. I know I'm not strong enough to lift a car off of myself, so I never get under one that isn't well supported, and rocked side to side after it's resting on the support system.
On the original question about crossovers, and i'll include H pipes too. I've put them in different positions depending upon layout of the chassis. Every time I've employed one, it has toned the exhaust noise down, as well as picked up power each time. Usually most noticable at low, to mid range RPM. I really don't think the position is critical either. You might gain a few HP by moving it, but with undercar room at a premium, especially with 3 inch pipes, You're pretty much limited by available real estate.
The 2004-2006 GTOs have a resonator behind the transmission that feeds both banks into one resonator, similar to a crossover. It is very well packaged for the room that was available. My guess is that Holden/GM must have done some testing to prove it's value, or they wouldn't have gone to the trouble of putting it on those cars.
I've also noticed that the exhaust tone changes when combing both banks, it seems to get less throaty, and has a different sound. Like 180 header systems have. A little higher pitched note, some people don't like the different exhaust sound, although I have never had a problem with it myself.
