From where I sit this brings the 2 cars very close together and if you take into account that Seb does not have VTC gears alone, it would put Seb's car in front overall and clearly shows that the larger housing is not hurting Seb's car. We have tested the exhaust and it limits boost and dramatically effects spool up because of backpressure with 2.5". Even more then you are showing for upgrading the intercoolers and intercooler pipe. The larger exhaust makes the most difference in the down pipe, test pipe area. We have tried both coning back down to 2.5" on the cat back and keeping 3" all the way and the low end gains are the same with just adding the front piping and the only effect the cat back has is about 15 HP at the very top end. If you also look at the fact that Seb's car can breathe better if it gets the external breather mods it adds up to me that the package of the 2 cars is the way to go. Your External upgrades absolutely work, what I am saying is Seb's internal and larger turbo housings also work and combined would offer superior results.
