3SX Custom Non-Turbo Downpipe (Frontpipe)

Finally a modification that REALLY helps the non-turbo 3S cars! These custom high flow downpipes replace the stock restrictive pipe with a larger diameter and smoother flowing pipe. The pipes from the manifolds are 2" and mandrel bent to merge together into a 2.5" straight through pipe ending in a 2.5" flange. Includes flex section, hanger bracket, threaded O2 sensor plug, and comes with the necessary gaskets and pipe clamp for installation.

The 3SX pipe is a 2-piece pipe. The main piece connects to the main cat and rear manifold or rear pre-cat. It uses a swivel-flange to connect to the rear manifold/pre-cat. The Federal-Spec pipe comes with the longer "L" front piece that mates up to the front manifold. The California-Spec pipe comes with the shorter straight front piece to mate up to the front pre-cat and includes a O2 bung for hooking up the O2 sensor. The Cali-spec pipe also includes a plug for O2 bung in the main piece (only used for the Fed-Spec).

The 3SX downpipe greatly reduces the restrictions and turbulence created by the stock pipe. This is a great way to add 10-15 hp to the non-turbo cars - both the DOHC and SOHC!!

3SX NonTurbo Downpipe (Fed-Spec or Cali-Spec): $309.95
(See discussion below to determine the pipe you need.)
Add a 2.5" Race Pipe for only $40 - Save $10!!

Limited Time Combo Special!!
For a limited time, get a great deal on an NA exhaust upgrade!
Get a 3SX NA downpipe and a Random Technology 2.5" High-Flow Cat and save $50!!

3SX NA DP + RT 2.5" Cat: Reg 559.90 --> Special $509.95!!
Add a 2.5" Race Pipe for only $40! STILL Save $10!!

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Which NA downpipe do you need?
Federal-Spec versus California-Spec

The distinction of Fed-Spec versus Cali-Spec actually has nothing to do with where you live or where the car came from - they all came from Japan! ;-) It has to do with emissions laws and how they changed over time, and the difference actually is in what year they are...

Federal Spec: As a general rule, all of the 91-93 non-turbos are federal-spec, have only one main catalytic converter between the downpipe and exhaust, have only one O2 sensor mounted just before the main cat and after the flex section, and the downpie connects directly to both exhaust manifolds.

California Spec: 96+ are Cali-spec. These cars have small "pre-cats" immediately off the exhaust manifolds as well as the main catalytic converter, and have 4 O2 sensors. This pipe connects to the pre-cats, and includes the necessary O2 sensor plug on the front part of the pipe. The 3SX pipe kit includes a O2 plug to plug the hole in the rear of the pipe by the main cat.

94-95 Cars: The 94 and 95 cars are mixed between Fed-Spec and Cali-Spec so you need to check before ordering to determine which model you have.

TIP! Determining your Pipe: We recommend that you check your undercarriage to see which downpipe you need before ordering. An easy way to check is look for the O2 sensor. If it is back in the middle of the car just before the main cat, you need the Fed-Spec pipe, if it is right under the oil pan of the motor and you see the bubble of the front pre-cat, you need the Cali-spec pipe.

Stock Fed-Spec 3SX Fed-Spec Stock Cali-Spec (with front pre-cat attached) 3SX Cali-Spec

 

 

6/4/2010 UPDATE:
These are now BACK IN STOCK! WOOT!