
Originally Posted by
trx2stroke4life39
They can fix the SEL, a dual octane let you run both 87 and 93 it will reference different spark table base on knock depending on octane. I have never really looked at the form(I do my own tuning) your best bet is to call the shop and they will ask you everything they need to know. I would recommend just getting a tune for the highest octane available in your area.
On the form the dual octane is for 87-89 and 91-93, not 87-93. 87-93 would make sense, but 87-89 and 91-93 seems kind of pointless.
2000 GMC Sierra 5.3L 4x4 ECSB