I've been running the do88 big pack on my car for years. It works well. Mine is the old version though with the tube/fin core rather than the bar/plate. At the time, this was the only off the shelf intercooler that was actually outperforming the 997.2 intercoolers in all areas (flow, heat dissipation and thermal recovery) except for weight, so I bought a 997.1 big pack kit and made it work.

 

4.5"?

 

I think they are 5" thick but I will be at the car tomorrow with the bumper off and can confirm it.

 

Those are big, mine are a lowly 3.5"...

If they do produce those in a 4.5" versions n with those fancy ducts, I could be tempted.

 

Im selling my SRM intercoolers if you’re interested

 

Was too busy at the shop to come back to this on Friday, but confirmed they are 5".

 

Those must work well, as mentioned, am curious to see if they do produce these new units.

 

I'll be honest I wasn't too happy with their cooling capacity when I was pushing the K16s, but in hindsight I don't think any intercooler would've been happy with turbos so far off their compressor map and all the extra heat that created, plus filters on turbos pulling in hot air. IATs dropped a good bit with the XR1000s even though it was making a lot more power, and I'm hoping the new intake setup that draws cooler air helps reduce it even further.

I immediately noticed a difference in power/response (due to greater flow, I assume) when I went from the 997.2s to these.

 

What are the RS intercoolers good to? I thought the 997 GT2RS puts out about 20 psi and the plastic end caps bust off if they go any higher.

 

No idea, I've never personally seen one fail but have seen lot of posts saying they will. I'm guessing it has happened to a small number of people and is now accepted as inevitable. Common preventative measure for the end tanks coming off is to use an epoxy around where they meet the core to bond the core to the end tank permanently. I pressure tested the system up to 2 bar with no leaks back when I ran the 997.2s and I did epoxy the end tanks just in case.

 

It is also possible to blow a hole through a welded end cap.... and when you do, and cannot figure out why your car is running so badly because it doesn't through a code...

 

Mine blew at track, were epoxied. It's not about amount of boost but a pressure shock if BOV's are slow.

 

Sounds like a blow off valve issue rather than an intercooler issue?

 

I ran the OEM7.2 intercoolers for many years at up to 20 psi without issues and pressure tested them regularly. I did not have the epoxied but did make sure the end tanks were crimped down tightly. Up to 600whp, these are a great solution, they are cheap, work well, and are lightweight. It’s a good all around package.

The new D088 big coolers for the 996 look very good and will likely be the best off the shelf solution for the 996 big hp applications. The only drawback will likely be weight.

 

Sounds good. 1.4 bar is the most I dare to run.