Thornton 350 headers
Out of Line, Everytime😉
Joined: Dec 2006
Posts: 10,108
From: Melville, Saskatchewan
I thought I would revisit this thread since I finally did install the shorties in place of my rusted, ill-fitting long tubes. I used Pypes 2-1/2" downpipes and mated them to the remainder of my exhaust system after cutting the pipes just past the collector. They fit super tight in the engine compartment, and the passenger side actually needs to come out to flatten a relief where it hits the oil filter housing. But the goal was achieved - I can adjust my shifter linkage, the starter won't cook, and I can replace my front bushings without having to drop my exhaust system. As for the butt dyno? It's a dog. You can really feel the difference between these and long tubes. They look nice, and maybe someday I'll go back to a better set of long tubes. For now, they're fine.
Registered User
Joined: Nov 2017
Posts: 1,527
From: North Royalton, OH
I assume you got a set with the 2.25" collectors? I like the new SBO set except for the one flattened pipe. I would have like to seen an attempt to expand or an attempt to move that pipe over. Curious, what are the specs on your car, surprised it is really noticeable.
Out of Line, Everytime😉
Joined: Dec 2006
Posts: 10,108
From: Melville, Saskatchewan
Fair enough, that 1/4" worried me, shows it makes a difference even on a mild motor. There is probably 15 hp and possibly more torque lost vs long tubes. Shorties are a comprise but have advantages for space. I have 2.5" exhaust routed under a single hump crossmember and still have decent ground clearance thanks to these Sanderson headers. I noticed a loss from my Sanderson's and 2.5" X pipe exhaust, especially up top compared to manifolds and 1 7/8" dual exhaust. Probably a good chunk is the 2.5" pipes but anything is better than factory log manifolds for flow.
Last edited by olds 307 and 403; Aug 29, 2020 at 03:32 PM.
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