Exhaust for NA 650 hp bbc 540

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03-06-2020, 02:05 PM

#11

McNick

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Thanks for all input

Thank you so much everyone for all the input! I think I’ll go for Diamond performance Thunder & Lightning cast headers.

03-06-2020, 02:14 PM

#12

Baja Rooster

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Quote:

Originally Posted by McNick

Thank you so much everyone for all the input! I think I’ll go for Diamond performance Thunder & Lightning cast headers.

Excellent move.

03-06-2020, 06:25 PM

#13

KAAMA

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Quote:

Originally Posted by Sonic30ss

this ^
had Gil’s switched to the Diamond cast header, boat runs and sounds better. 6mph at cruise and 4 top end, tho I’m sure prop tune helped those #s
540 making 646/690 on dyno

Ok, so, is that 646 ft.lbs of torque and 690hp with tubular dyno headers???----- or with the Diamond Thunder & Lightning cast aluminum manifolds???

03-06-2020, 09:12 PM

#14

MASOMAN

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Are those numbers with the Sonic or the Excalibur ?

03-07-2020, 11:00 AM

#15

endeavour32

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If you are serious about making power, buy the Thunder and Lighting headers (KE headers). I've used Gil's, Stainless Marine, and Eickerts all on the same engine. Stainless and Gils will give you exactly the same results. I switched to Eickerts and instantly gained 2-3 mph. Nothing else was changed and that was on a single engine boat, with a 439 BBC with peak hp at 6100 rpms. midrange pull was noticeably stronger and top speed improved and stated. I would be putting them on my new boat, but I don't see how they will work in a staggered set up. Go with the Eickerts and don't look back!