From what I've seen most true dual exhaust setups make less hp/tq than a single 3" catback. The worst one's are ussually 2.5" setup's. The length of the pipes going over the axle kills it.
The most affective are the 3" duals dumping under the car before the axle but they are stupid loud.
I like the electric cutout with magnaflow catback. Simple and affective.
I'd spend the money on selling the SLP headers and putting on Kooks or American Racing.
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