to be fair, i was VERY sceptical about sp engines when i first started enquiring on this forum, but i can 100 percent catagorically say that there is a difference, im so glad i took peoples advice and got some, to put it in perspective, i was closing about 20-30m down the straight on some people at 3 sisters the other week during racing, lap after lap on some guys, ok yeh theres sp engines and SP engines, no doubt theres some that are better than others, and im sure some people will be lucky and get a race tuned one that is as good as an sp, but im sure theyre pretty rare....
....either way i can only speek from the very little experience i have, and say yeh sp engines are better than standard ones...
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