[a427sc]

Undercar exhaust also adds significant heat to the foot boxes. The added backpressure from restrictive header pipes, smaller mufflers and long convoluted tailpipes precludes most performance mods to the motor as it just cannot breath.

Now if you want to get fancy and $ is no object, have a custom set of tri-Y headers made, stainless of course to withstand the heat, with the 2 secondary pipes bending under the car side by side, joining under the foot box. You can use oval pipe ala NASCAR, and performance oval inlet mufflers. The tail pipes will be a chore, fabricating all the bends in oval tubing, and there is the interference problem with large rear tires.

I still have the old style ERA undercar exhaust system hanging in the garage rafters. I bet 4 or 5 cars went through CT inspection with it before they allowed sidepipes (with heat shields).

Of course, other brand kits may have more space....

Don