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. . . You might gain 1-3hp with an axleback . . .
if that, if you're lucky

if you are considering an axle back, do it for sound; "I'm dubious" about the manufacturer's claims of performance improvements ("Hello Mr. Dubious!")

Apparently on highly modified cars -- like with superchargers, long-tube headers, high-flowing pipes, etc. -- the restriction of the muffler can become a factor, but like they said, the stock mufflers flow pretty well so it's not significant for a stock or lightly modified car
 

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Welcome Salinas! My recommendation is get the air intake + tune for your first mod. It will feel like a completely different car. Then there are other fairly cheap mods you can move onto...like gears or exhaust. If you are a daily driver and want to keep gas cost down...you can do a 87 or 89 tune. If it's a pleasure driver and don't care about gas prices - go for the 93 octane tune. I'm not sure on the exact numbers, but as you go up on the octane, the HP goes up too. That's my .02 cents. :bigthumbsup
 
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