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so the 1 5/8 tube dimension seems to be the answer for more ponies. didnt even realize GHL had offered heater boxes, just headers. thanks for the tip.
one post said 8-12 hp increase w/ssi's and m and k exhaust.
pelican or ghl (not sure whom) is claiming 30 hp increase! yikes i like those numbers if they can be verified. ghl wants 1600 bucks less muffler vs. ssi's are about 1006 bucks less muffler.
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