Doug Thorley Headers are designed to outflow your stock exhaust manifolds. These headers increase gas mileage and give your engine more horsepower across the entire RPM range. The Tri-Y configuration builds the most power in the middle RPM range, which is great for towing and steep grades. To make these headers last, Doug Thorley Headers made them out of durable 14-gauge mild steel with 3/8 in. thick flanges and 5/16 in. collector rings. To prevent leaks, these headers have an O-ring welded into the flange, in addition to the high-temperature gasket provided.
Unless otherwise noted, these headers are designed to fit the vehicle as it came from the manufacturer. This includes components like cylinder heads, chassis, steering, motor mounts, body mounts and bushings, etc.
If your vehicle is using aftermarket components, parts from other applications, or custom altered parts, then it is the installer's responsibility to verify fitment.
Brand: Doug Thorley Headers
Manufacturer's Part Number: THY-306Y2-S
Part Type: Headers
Product Line: Exhaust
Header Style: Tri-Y
Header Material: Steel
Header Finish: Chrome
Primary Tube Diameter (in): 1 3/4 in.
Collector Attachment: Stock flange
Collector Diameter: 2.500 in.
Primary Tube Gauge: 14-gauge
Flange Style: Standard
Flange Thickness (in): 3/8 in.
Bolts/Studs Included: Yes
Gaskets Included: Yes
Reducers Included: No
Y-Pipe Included: No
Motor Mounts Included: No
Transmission Mount Included: No
Quantity: SOLD AS A PAIR
Notes: Fits models with 4L80E transmissions.
Power Steering Yes
Power Brakes Yes
Air Conditioning Yes
Standard Transmission Column Shift No
Standard Transmission Floor Shift No
Automatic Transmission Column Shift Yes
Automatic Transmission Floor Shift Yes
May require alternator/generator bracket.
For legality under CARB regulations, the included connector pipe must be used on vehicle originally equiped with a catalytic converter.
Will not fit column shift.
|year make model||1990-2000 Chevy Class A Motorhome thy306y2s|
|Manufacturer||DOUG THORLEY HEADERS|