Downpipe Exhaust/Test Pipes for 2003-2007 Nissan 350z With Gaskets And Bolts

Fitment:

• 2003-2007 NISSAN 350Z(Z33 Chassis) VQ35DE
  
• Note: Also fits Infiniti G35. See full compatibility here.

If you like this 1999-2006 4.8L, 5.3L, 6.0L Test Pipe, please feel free to buy it; after purchasing, you can always contact us for a full refund if you don't want it;

What vehicles does this downpipe fit?

A1: The Flashark Y-pipe downpipe bolts directly to the 2012-2018 Jeep Wrangler JK with the 3.6L V6 pentastar engine. If you're running a 2-door (JK) or 4-door (JKU), this fits — same engine, same turbo housing. The loop delete design removes that useless factory exhaust loop that adds backpressure for zero reason.

Will installing a downpipe on my JK set off the check engine light?

A2: Honestly? Probably. The 3.6L is sensitive to exhaust modifications — the O2 sensors and catalytic converter efficiency monitors don't like sudden flow changes. Most owners report a CEL within 50-200 miles after install. You can either run an O2 spacer, use a tuner to disable the rear cats, or just accept it if you're wheeling anyway. The OE cats are downstream of the downpipe, so you're only deleting the uppipe loop — but the ECU still watches everything.

What's the horsepower gain from a JK 3.6L downpipe?

A3: Realistically, you're looking at 10-20whp on a stock tune. The pentastar responds better to bolt-ons than most people expect — upgrading from the restrictive loop delete pipe to a 2.5" free-flowing downpipe helps the turbo spool faster and reduces lag. Throw in a tune and you could push 25-35whp over stock. No, it's not a cheap turbo kit, but the downpipe is where the flow restriction lives on these rigs.

Is this downpipe street legal?

A4: This is a loop-delete design — it removes the factory exhaust gas recirculation loop, not the catalytic converters themselves. The rear cats stay in place, so emissions-wise you're in better shape than a full catless setup. That said, some states (cough — California — cough) will fail you at inspection if the delete triggers a CEL and they hook up a scanner. Check your local laws before you commit.

Do I need a tune after installing this downpipe?

A5: For the loop delete? No — the engine doesn't need re-tuning just to remove a restrictor. But if you're doing more than just the downpipe (intake, exhaust, bigger tires), a tune becomes almost mandatory. The 3.6L responds really well to tuning. AFE, Superchips, and DiabloSport all make tuners for the JK platform. Without a tune you're leaving 15-20whp on the table.

What's the difference between a loop delete and a full catless downpipe?

A6: The loop is a small return path in the factory exhaust that routes exhaust gases back into the intake — it's a holdover from older emissions tech and adds unnecessary backpressure on a modern engine. Removing it frees up flow. A full catless downpipe removes the catalytic converters entirely, which gives you more power but kills your street legality in emissions-heavy states. The loop delete is the middle ground: more flow, less drama.

What other modifications pair well with this downpipe?

A7: A cold air intake is the obvious first step — you're already improving exhaust flow, so letting the engine breathe better on the intake side makes sense. A cat-back exhaust ties everything together. If you're actually wheeling hard, consider upgrading your intercooler too, because the 3.6L runs warm when you push it. And yes — a good tuner unlocks everything these mods can do together.

How difficult is the installation on a 2016 JK?

A8: If you've got basic hand tools and a jack, you can do this in an afternoon. The hardest part is getting the old loop pipe off — rust and heat have probably fused the flanges together. Soak the bolts with penetrant spray the night before. You'll need a 12mm wrench, a 15mm socket, and patience. The new Flashark downpipe drops right in with new hardware. No cutting, no welding, no fabrication.

Why choose Flashark over other brands?

A9: T304 stainless steel construction, mandrel-bent tubing, and CNC-cut flanges. The welds are actually smooth on the inside — not some lumpy mess that disrupts flow. Plus, Flashark designs their downpipes specifically for the JK's exhaust routing, not some generic V-band setup that requires adapters. You're paying for fitment accuracy as much as the material quality.

Will this affect my daily driving?

A10: The loop delete makes the turbo spool just a bit faster — you'll notice less hesitation off the line. At idle, it's basically the same. Under heavy throttle, the exhaust note is slightly more aggressive but not obnoxious. For a daily-driven JK that also sees trail time, this is one of the better bang-for-buck upgrades you can do.

Does this downpipe work with aftermarket headers?

A11: It should — the mating point is the turbo outlet flange, which is standard. But be careful: some header combos change the overall exhaust routing and may require a custom midpipe. If you're going that deep into the build, talk to Flashark's tech support first to confirm fitment with your specific header setup.

Is the JK 3.6L downpipe good for off-road use?

A12: The 3.6L pentastar wasn't built for serious boost — it's a mild turbo V6, not a built race engine. But for off-road, the faster spool response from removing the loop helps when you're crawling over obstacles and need instant throttle response. The stainless construction handles the abuse fine. Just make sure your O2 sensors are properly plugged in — the last thing you want is a raw code setting you into limp mode on the trail.