Hey guys just need opinions. Which would be better? The 96-97 slp shorties with 1 3/4 primaries or pacesetter shorties with 1 5/8 primaries. This is a dual cat set up.Need smog legal headers since I'm here in wonderful California. Thanks in advance...

 

Is the engine stock, or modified? If modified, what's been done?

 

355 11.1 , cc503 , 180 darts...Thanks

 

With that head, even straight out of the box (~260cfm), I would recommend the 1-3/4" primaries. I had some JBA 1-5/8" shorties on a basically stock (bolt-on) LT1 and they really seemed to choke the engine at high RPM.

The CARB-EO requirement is not header friendly on the dual-cat engines, so the larger diameter would also seem to provide an improvement on that basis also.

 

Cool Thanks I appreciate it...

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why shorties?

 

shorty headers, some, are CARB legal so for Calif....that means a header that does not relocate the stock CAT position

there are some "shorty" headers that do that BUT don't have a CARB certification because the MFG does not spend the high $ to get them that certification

Longer headers require moving the CATS back...which won't fly on smog.

 

Yes California doesn't give us many options.I wish I could do long tubes....

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I would go with pacesetter shorty headers.
SLP shorty comes up and down....... it create lot burn Spark plug wires......

 

OP

whatever header you get, have them ceramic coated. I have used Jet Hot on multiple cars/headers

 

Yep
Jet has done cermaic coating on my car, since last 15 years
And I am very happy with it