300hp99gt,
Which throttle body did you get? A 70mm FRPP or someone else's?
This is a good discussion - most of the mags I've read with dyno info show catbacks, etc., didn't add a lot of rwhp. Seems like you could spend $1000 to $1500 on a 99+ 4.6 and get maybe 20 rwhp. The x-pipe with cats sounds like a good hp/$$ ratio to spend on...
--jp
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