I have run the XE268 in a 400. For a low compression motor it is okay. I thought it really started to fall off at about 5K. For a street motor I didn't mind it, just depends on what a person is looking for. I ended up pulling it and going with more compression and a 2802 and liked that combo much better. I was running 6X-8's with the XE268 so it was pretty darn low compression, and #13's with the 2802. No real #'s or times to back my opinion up.
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