I'd say thats the order (not looking at the IFX one as it's a) hard to get and b) not really applicable to most people I'd say)
1st: Forge Motorsport Intercooler
2nd: Wagner Tuning Gen1 Intercooler
3rd: Airtec Intercooler
(4th: Wagner Tuning Gen2 Intercooler)
Why?
- The Forge (without the Forge boost pipe kit) one has the biggest core, the best sidepods and it's quality is also good.
- The Wagner Gen1 is super close to the Forge but it misses it close in terms of cooling performance. Also the hoses provided with the kit are not the best. Hose size is the same to the Forge one tho.
- The Airtec (without the Airtec boost pipe kit) has the same core (afaik) as the Forge, but not as good designed sidepods and also has a different inlet and outlet hose diameter (dunno if that's good or bad, but limits which aftermarket parts fit).
- The Wagner Gen2 has a worse core than the Gen1 to save costs. But I am missing comparative data here to compare this one to the others, so I put it in brackets as it may be better but I have no experience to back this up.
So in general the Forge one offers the biggest potential, especially when you wanna do some remapping of your car. All the listed Intercoolers are way superior to the stock one and are a worthy upgrade. But since the Wagner Gen1 in my car already runs at it's absolute limit with higher ambient temperatures I'd say none of these will suffice if you want to run higher power figures on a track with warmer ambient temperatures.
Just my two cents what I heard so far. Correct me if you have more infos
