I was considering one of these X-pipe crossovers. Reading the Dr. Gas literature, these things work by evening out the uneven firing order in each pipe (think of the V8 as two 4-cylinder engines, each with its own exhaust pipe, but not properly synchronized because they are joined by a 90-degree crankshaft). Unfortunately, it is exactly that uneven firing order that gives a V8 that distinctive popping growl. Dr. Gas' ad says that the X-crossover makes a V8 sound like a Japanese motorcycle. Now, I love the wail of a Jap motorcycle, but I don't want my GTO mistaken for one! I think I'll give up a little efficiency in my street GTO for that V8 exhaust growl I love.
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