Mac 3" ExhauSt System

DanmMh

New Member
Jul 20, 2011
13
0
1
hi, im about to buy my catback from mac, but i just realized that they have the 3" pipe, does any body know which one will give me more HP gain ? the 3" or 2 1/2 " ? ?
 
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mustangjoe02

Member
Apr 29, 2011
84
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7
2 1/2 is fine. if you go to 3 in you could lose some back pressure and actually lose low end torque. it also depends on your car. i.e. if your s/c'ed
 
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