Originally Posted by simon-srt6
I wonder how much better your mod is over mine, as I could notice an improvement, but you make it sound that yours was greater. Mine is better off the mark and then between 5000 & 6000 rpm and stronger on the gear changes. Mid range seemed similar, so I think it is at WOT at higher revs where most of the gain is, other than a bit more torque "off the mark"
Si
The SL55 airbox filter area and the in-n-out openings are approx 25% larger then the stock set up, so there are some gains to be found but only if you already had the Y-Pipe installed. It was getting time for new air filters anyway so that helped offset the cost for the SL55 boxes. Plus I can still add K&N's down the line.
I plan on installing LET's 185mm Pulley (20% boost) so it makes sense to increase the intake air flow.
It's just one more option of many that are out there for SRT owners.