I have a GTR with exhaust and a GtiR with exhaust.
There is more lag on the GTR which slows the SS400.
there is only about ($20,000) and 0.2 of a sec advantage in the GTR.
After 400 metres the GTR keeps flying the Gtir takes a lot longer to get to 200Km/hr plus.
The GTR has better torque which is what keeps it pulling and gives it abetter time around a track.
The GTir has 250 kg less weight.
It takes more than boost, exhaust and intake to get into 11 secs on both cars.
BUT, A GTiR is the most fun car to drive on this planet. It is like a go kart and even at low speeds feels incredibly fast.
So it is correctly dubbed son of Godzilla, (Unlike the Aus spec 200sx which is its poofy half brother)
LOL (flame suit on)