if you get grs only get the one with built in air diverters the steer performance version or something..
avoid the airtec , its a rebranded ebay pos..
Trust me i personally, 1st hand tested like 10x different intercoolers for the r53s and only 3x added power actually..
you want a good ic buy the gp repop , I will add link..
gRs liquid cooled intercooler was best , 2nd was gp intercooler and 3rd was the grs performance version.. ALL other intercooler only robbed intake velocity or boost.. please trust me , you'll thank me after because that airtec overpriced pos I hate , shame they even sell that rebranded ebay pos. All they do is paint a logo on it and charge you 4c the price..
heres the BEST intercooler you gonna get , unless you do the liquid cooled grs but your looking at over 2000$ to get that up and running . But lol it was sooooooolo worth it because my God my car made good power with it.. though the gp intercooler was dang close...

https://ebay.us/m/gkBzbL

 

I can personally voich for orange Also , they're over seas but you'll still get you stuff in like a week.. their services are outstanding and I highly highly suggest checking out their other products because they got some killer stuff.. I'm actually going to order my jcw shiftlight from them again..lol itle be my 3rd one I've ordered from them now.

 

Thanks for the feedback. I’ve got experience with 3 different brands and the reason I’m moving this direction. Just trying not to spend full price.

 

Sorry my inbox was full so please re message me to connect.

 

ADAM is correct , nothing you put on the top of the engine works unless its water to air , even the GP intercooler offers minimal gains .