You should be able to do 150 easy 373 with a 26 inch tire . maybe your shifting out of 4th to soon ?
I find for top speed my guts go before fith does. top speed by me 173 mph on christmas day between Halifax and Moncton The Cop was really nice turned his lights on a couple miles ahead of me gave me a severe verbal warning and then let me know he couldnt ticket me because his radar gun wouldnt go that high in kmh so he flicked it to mph which they cant use here.
Other solution is a little bit of n20 for fith....
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89 with 395 single stage n2o and 373's need suspention upgrade
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