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Well, if you have to worry about emissions testing, then I'd say, from the few threads we've seen, that shorties may be worth it if you can't run LTs. The Doug Thorleys seem to be the only ones that have been tested so far, so I'm only going off of those, but I imagine we'll be seeing more soon.
Personally, I had two sets of LTs, a set of mids', and finally ended-up with shorties on my last car and can say the sound and power are no comparison to shorties. However, after receiving two +$200 tickets for the LTs, I'll be going shorties this time, so long as there is at least a measured 10-15 RWHP improvement. For the money these are going for, that's CAI-plus $$$.
If you can get away from visual inspections, and have a good tuner and run cats', I think you're going to be okay.
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