After reading the MaxxTraxx thread to its conclusion, the pipe sounds like it might be worth a go. Moneyback guarantee makes it a win-win situation. If you like it, money is well spent; if not, money spent is money returned.
If you can get past the funky shape, it might actually give you what you want for top end performance. I am happy with low to mid range performers (even though I use the TRAXXAS Tuned Pipe a known top end pipe); I want offroad capability for my offroad truck, not speed.