That also plays a part yes good exhuast flow to the turbo spoke to couple people that have ran td05 on track and didn't like the lag when on and off acceleration
I'm pretty sure it will seal as the oem gasket is a lot softer it's not major warped the msl steel gasket didn't old long as the blocked didn't get decked before installing it
I would go for an greddy td05 16g I have ran both td04 and td05 I prefure the response of the td04 but all depends on what your using it for the td05 once fully kicked is nice lol
There is no way of telling no serial numbers on the actual gasket as well I have an old 1.2 mm Antena gasket here can measure it for you if it helps out
Hello mate as above you wont be making 500hp from an 4efte engine there is other options like 3sgte 2zz or forging an 5efe engine and yes you will need deep pockets!!