[CAPTAIN18B]

Do you guys have any input on which of these two would be better on a 5.3 LS in a 66HT that will be a street machine/daily driver? Also, any thoughts on 2.5" vs 3" exhaust? Thanks for any input.

 

[Shane65]

Stock front clip would narrow the choice to mid length. They tuck up pretty good on a low car. My preference was for 2 1/2" for an easier fit. Mine is a 5.3 in a wagon.

 

[CAPTAIN18B]

Good info. I wonder what kind of torque difference there is between the two headers. 2.5" pipes for fitment sounds like its a better solution

 

[ism deuce]

Good info. I wonder what kind of torque difference there is between the two headers. 2.5" pipes for fitment sounds like its a better solution

If you plan on no hp mods to a 5.3 LS engine, 2&1/4 would be a better choice. 3 inch guaranteed hp and torque loss. The 2009 Corvette base LS3 (430 HP) came with 2.5 exhaust.

 

[CAPTAIN18B]

Plan for the 5.3 is cam and valve train upgrade and tune. Target 400-450 flywheel hp, all coming in before 5500 rpm. Basically a strong dependable daily driver type that is manageable to drive. (i.e. so the misses can drive as well if she wants to). So, looks like 2.5" may be the best route. Thanks also ismdeuce.

 

[ism deuce]

Plan for the 5.3 is cam and valve train upgrade and tune. Target 400-450 flywheel hp, all coming in before 5500 rpm. Basically a strong dependable daily driver type that is manageable to drive. (i.e. so the misses can drive as well if she wants to). So, looks like 2.5" may be the best route. Thanks also ismdeuce.

Sounds like a plan. Headers with 1&3/4 primary tubes would be ideal.

 

[CAPTAIN18B]

99.999% certain I'm going with CBR headers. Just not sure whether to go with the mid length or long tubes from the