The price to pay for drop in is having to clean tb every now and then. For me, its not worth the miniscule torque increment and the price.....and the work to clean filter myself every 5K. Not only that, it increase the contaminant in your engine oil much faster. So for those that use FS for 10K, the silicon (dirt/sand/ext oil) level in your lube adds up over higher mileage usage. For 5K change, it makes not so much difference on lube.

You do save on buying stock filter every 10-15K but as the tb get dirtier, it should negate all the benefits of drop in..thus by the time you need to clean tb, you've unknowingly lost a good amt of performance overtime.

I rather just spend RM16 and change a new stock filter every 10K~15K, much cleaner engine and oil, no need spend energy to clean (lazy, no need maintenance) and retained consistent performance over time. PE filter is very cheap compared with filters like Honda that stock original costing RM55+ to RM70+....so its not an issue to change every 10~15K.

More over, the extra flow of air is much more beneficial if you run high speed most of time, not so much on normal driving.