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Originally Posted by my87Z
i have a 87 camaro that has the typical y-pipe and cat-back exhaust and that is fine for the wimpy 305 4brl in it now but i have a 385ci that i will be putting in it sooner than later, ive heard some say a Y-pipe into a 3"cat back system (without the cat), but i just can t see running this, a Y-PIPE  i just cant do it, and most all shops in my area wont mess with a custom (illegal) exhaust, even if paid to with no paper work, so i know i want long tube headers, and round mufflers, here is what i have come up with so far
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
http://store.summitracing.com/partde...5&autoview=sku
in a nut shell headman elite long tube headers w/3" collector, 12" collector extensions, 3"- 2.5" reducer, 12x4" moroso 2.5 in/out round tube mufflers, and then just a set of turndowns
what do you think of this exhaust system |
Do you have to qualify for smog any more?
If not, true duals, as you propose, would be the way to go with or without cats. Add a crossover pipe, it lets each side share the other, that is really helpful for flow. Doesn't so much matter whether an H or X pipe, just that it's there.
Be careful of ending the pipes anywhere besides under and slightly behind the rear bumper. There is a low pressure area that is always behind the forward moving car, it gets bigger with more speed and smaller with less. It is useful to use as a scavenge technique as it puts the tail pipes under a bit of suction. Dumping anyplace else requires knowing the airflow in that area, it's possible with side or under dumps to actually have a local air flow trying to pressurize the end of the pipes restricting their flow instead of helping it.
Bogie