A 2004 GM product may be old enough to benifit from an injector up grade.
Just up grading injectors to the newest generation had been fairly popular for fuel injected vehicles made before 2001.
Out of site aero mods will likely produce the most results by far for the lowest cost.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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