![Cast Iron Exhaust Manifolds for GM Gen III, IV LS Engines [Silver Ceramic Finish]](https://www.jegs.com/images/mini_750/300/387/387-31730-1flt.jpg)
FLOWTECHPART NUMBER: 387-31730-1FLT
Cast Iron Exhaust Manifolds for GM Gen III, IV LS Engines [Silver Ceramic Finish]
$33295
1 left in stockSilver Ceramic Finish
Cast Iron Exhaust ManifoldsGM Gen III, IV LS Engines 1 3/4 in. Primary Tube Diameter 2 1/4 in. Outlet Diameter 2-Bolt Exit Flange Nickel Plated Steel Mating Flanges High-Silicone Moly Ductile Iron Silver Ceramic Finish
FlowTech 31730-1FLT Cast Iron Exhaust Manifolds:
- Stay close to the engine for multiple chassis applications
- Less underhood noise than headers
- Uses factory or aftermarket gaskets and fasteners
- Includes nickel plated steel mating flanges
FlowTech 31730-1FLT Cast Iron Exhaust Manifolds Note:
- Not compatible with 2004-2006 Pontiac GTO starters and bellhousings
Emissions Note:
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Exhaust Manifolds that Stay Close to the Engine
FlowTech GM LS Swap Exhaust Manifolds will fit multiple GM Gen III and IV LS engine swaps and exhaust configurations with their short block hugging design.
Part TypeExhaust Manifold
Product LineFlowTech GM LS Swap Exhaust Manifolds
BrandFLOWTECH
Package Height9.0
Package Width12.0
Package Length21.0
Weight32.0 PG
Part CategoryPerformance Parts
Collector Attachment2-bolt flange
Exhaust Manifold Gaskets IncludedNo
QuantitySold as a pair
Mounting Hardware IncludedNo
Exhaust Manifold MaterialHigh silicon ductile iron
Engine Make/SizeGM LS GEN III & IV
Exhaust Manifold FinishSilver Ceramic
Vendor Part Number31730-1FLT
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations




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