How much power will these add
Thread Starter
Safety Car
Joined: Jul 2008
Posts: 3,966
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From: Made In America
St. Jude Donor '10-'11
How much power will these add
Drifting
Joined: Jun 2007
Posts: 1,478
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From: Formerly from the Great White North but now residing in the Desert Southwest NM (The Land of Dis-Enchantment?)
To really achieve any meaningful HP increase, you'll also need a BigMouth intake or port your stock intake and plenum
Race Director
Joined: Nov 2003
Posts: 12,221
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
After seeing a stock set 1st hand, it's hard to imagine that claim is true. I suspect any improvement was measured in conjunction with a large base (which also would improve flow).
The problem I see is the SLP tubes are BARELY bigger than stock tubes. And, the siamesing is so minor that neither change (vs stock) seems likely to significantly improve air flow. Plus, their castings are ROUGH (inside and out) -- which can't help air flow either!
As such, I went ALL the way thru my tubes expanding their size at least 10-15%. Plus, I added significant add'l siamesing.
If you're willing to buy a few inexpensive tools and "get busy", I think this option is well worth while. Otherwise, TPIS tubes or AS&M tubes would provide better results. (They are smooth, mandrel bent tubes that come sufficiently larger. Even though they're more expensive, the extra size is their from the get-go.)
One last tid-bit....The only person I know who did a back-to-back with AS&M vs SLP on an stock motor (with mild head porting) ran 2/10ths secs SLOWER after installing the SLPs. IOW, HP dropped 20 ponies with the SLPs -- as compared to the TPIS/AS&M stuff!
The problem I see is the SLP tubes are BARELY bigger than stock tubes. And, the siamesing is so minor that neither change (vs stock) seems likely to significantly improve air flow. Plus, their castings are ROUGH (inside and out) -- which can't help air flow either!
As such, I went ALL the way thru my tubes expanding their size at least 10-15%. Plus, I added significant add'l siamesing.
If you're willing to buy a few inexpensive tools and "get busy", I think this option is well worth while. Otherwise, TPIS tubes or AS&M tubes would provide better results. (They are smooth, mandrel bent tubes that come sufficiently larger. Even though they're more expensive, the extra size is their from the get-go.)
One last tid-bit....The only person I know who did a back-to-back with AS&M vs SLP on an stock motor (with mild head porting) ran 2/10ths secs SLOWER after installing the SLPs. IOW, HP dropped 20 ponies with the SLPs -- as compared to the TPIS/AS&M stuff!
Slingshot
Joined: Dec 2001
Posts: 3,817
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From: Charlotte NC
Team Owner
Joined: Sep 2003
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From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
To take advantage of these runners one must consider a cam, heads, ported intake base and then the runners will get that extra 20 HP.
Best to start with internals before messing with bolt-ons
Best to start with internals before messing with bolt-ons
