Everything I have read people have lost performance with this mod UNLESS your cars ECU is tuned or remapped for the extra air which in turn leads to you needing more fuel. It is a significant loss I am talking If I remember correctly 12 HP, I did a search and here is the thread with the dyno. Some members have run this on there car at the track and say they see a gain. I don't know how you see a gain when it will retard the timing.
https://www.crossfireforum.org/forum...ad.php?t=19508 Simon and Steve are you sure your feeling gains ??