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A Y-pipe replaces the factory catalytic-converter section on the VQ37VHR-powered 370Z (2009-2020), merging the two headers into a single midpipe. Options split into two camps: high-flow catted pipes that stay smog-legal, and test pipes (catless) that free up more flow but are off-road/track use only in most states. All of these fit the 370Z’s 3.7L VQ37VHR and share compatibility with the related Infiniti G37/Q60.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | ISR Performance Exhaust Y-Pipe | $314-$380 | Amazon · eBay |
| 2 | DC Sports Y-Pipe | $240 | Amazon · eBay |
| 3 | Berk Technology Test Pipes | $325-$390 | Amazon |
| 4 | Kinetix Racing High Flow Cats / Downpipes | $490-$525 | Amazon · eBay |
| 5 | Invidia Test-Pipe with High-Flow Cat | $823-$1,480 depending on retailer and sale | Amazon |
| 6 | Z1 Motorsports Standard Stainless Steel Y-Pipe | $250 | Amazon |
| 7 | Fast Intentions High Flow Cats | $709-$929 depending on resonated vs. non-resonated | Amazon |
| 8 | STILLEN Hi-Flow Catalytic Converters | $588-$735 | Amazon |
| 9 | Tomei Expreme Ti Titanium Mid Y-Pipe | $923 | Amazon · eBay |
| 10 | Motordyne ART (Advanced Resonance Tuning) Test Pipes | $1,027 | Amazon |
The picks, in detail
ISR Performance Exhaust Y-Pipe
A budget-friendly stainless Y-pipe built with bellowed flex sections for ground clearance and tone, one of the most commonly recommended entry-level swaps in the 370Z community.
- 2.75″ stepping to 3″ stainless steel piping
- Bellowed flex sections for clearance and vibration isolation
- Velocity-merge design
- Fits 370Z and G37 (non-AWD)
- Lowest price of the name-brand options here
- Strong reputation for tone and ground clearance on lowered cars
- Catless (test-pipe) design — off-road/track use only in emissions-tested states
- Will trigger a check-engine light on some cars without a tune or resistor kit
DC Sports Y-Pipe
The most affordable name-brand option, a mandrel-bent stainless Y-pipe from a long-running tuner-parts brand.
- 2.5″ mandrel-bent stainless steel
- 2.5″ header-side inlets, 3″ merged outlet
- Fits 370Z, 350Z, G35, G37, Q50, Q60
- Smooth-flow mandrel bends, no crimping
- Cheapest Y-pipe on this list from a recognized brand
- Broad fitment across the Z/G/Q platform simplifies parts sourcing
- Catless — same off-road-only caveat as ISR
- Less track record specifically on 370Z builds than ISR or Kinetix
Berk Technology Test Pipes
A well-regarded 370Z-specific test pipe from a shop that also sells a CEL-fix resistor to quiet the check-engine light that catless pipes usually trigger.
- Stainless steel construction sized for 370Z/G37
- CEL-fix resistor kit available as an add-on
- Direct-fit to VQ37VHR headers
- Test-pipe (catless) design
- CEL-fix option specifically solves the check-engine-light problem catless pipes cause
- Strong 370Z-specific reputation and fitment
- Catless — off-road/track use only in emissions-tested states
- Pricier than ISR or DC Sports for the base pipe alone
Kinetix Racing High Flow Cats / Downpipes
A catted (high-flow metallic catalyst) option for buyers who want most of the flow gain of a test pipe while staying smog-legal.
- High-flow metallic catalytic converters, not catless
- Direct-fit for VQ37VHR-powered 370Z
- Stainless steel construction
- Smog-legal in most jurisdictions — verify local rules
- Catted design avoids the check-engine-light and emissions-test problems of a test pipe
- Real flow improvement over the stock catalytic Y-pipe
- Costs more than the catless test pipes on this list
- Less outright flow than a full test pipe, by design
Invidia Test-Pipe with High-Flow Cat
A hybrid option — technically catted with a high-flow catalyst rather than fully catless, aimed at buyers who want more sound and flow than a stock cat without going fully off-road-only.
- 60mm high-flow catalytic converter
- CEL-fix bracket and celfix hardware included
- Fits 370Z and G37
- Stainless steel construction
- Middle ground between a full test pipe and the stock catalytic Y-pipe
- Includes CEL-fix hardware in the box
- Widest price swing of anything on this list — confirm the exact listing before buying
- Not as aggressive a flow gain as a true catless test pipe
Z1 Motorsports Standard Stainless Steel Y-Pipe
A house-brand catless Y-pipe from one of the largest Z/G-platform specialty shops, built as a 3-piece design with swedged slip joints for easier installation and future serviceability.
- 3-piece design with swedged slip joints
- 2mm wall stainless steel
- Fits 370Z, 350Z, G35, G37
- Catless design
- 3-piece slip-joint design is easier to install and service than a one-piece welded pipe
- Backed by a specialty shop with deep Z-platform parts and support experience
- Catless — off-road/track use only in emissions-tested states
- No CEL-fix hardware included, unlike Berk or Invidia
Fast Intentions High Flow Cats
A catted option from a brand that also sells a resonated version specifically to add low-end torque back that a straight test pipe can lose.
- High-flow catalytic converters, not catless
- Available in resonated and non-resonated versions
- Direct-fit for VQ37VHR
- Stainless steel construction
- Resonated version specifically targets low-end torque, an issue some catless test pipes have
- Catted design avoids the CEL and emissions-test problems of a test pipe
- Among the pricier catted options on this list
- Resonated version costs more than the plain high-flow version for a torque gain that’s hard to verify without a dyno
STILLEN Hi-Flow Catalytic Converters
A catted option from a long-running, mainstream performance-parts brand with an independently cited 9-10 rear-wheel-horsepower gain over the stock cats.
- High-flow catalytic converters
- Fits 370Z, 350Z, G35, G37
- Mainstream brand with broad platform catalog
- Smog-legal in most jurisdictions — verify local rules
- Established mainstream brand, not a small tuner shop
- Specific, cited horsepower gain rather than a vague flow claim
- Frequently out of stock — availability is a bigger obstacle than price
- Not as aggressive a flow gain as a full catless test pipe
Tomei Expreme Ti Titanium Mid Y-Pipe
The premium pick — full titanium construction from a well-regarded Japanese exhaust maker, for buyers who want the weight savings and heat properties titanium offers over stainless.
- Full titanium construction
- Expreme Ti product line
- Fits 370Z Z34
- Significantly lighter than stainless equivalents
- Titanium construction is a genuine weight and heat-resistance upgrade over stainless, not just a marketing claim
- Well-established, respected Japanese exhaust brand
- By far the most expensive Y-pipe on this list
- Titanium’s benefits matter most to track/weight-focused owners, less to a daily driver
Motordyne ART (Advanced Resonance Tuning) Test Pipes
A catless test pipe engineered specifically to avoid the loud rasp and drone that usually come with going catless, for buyers who want the flow gain without the harsh sound.
- Advanced Resonance Tuning (ART) internal design
- Catless for maximum flow
- Engineered specifically to reduce rasp and drone versus a standard test pipe
- Direct-fit for VQ37VHR/HR engines
- Purpose-engineered to solve the drone/rasp problem that makes many catless test pipes unpleasant to drive daily
- Real flow gain of a catless design without the usual sound tradeoff
- Most expensive catless option on this list
- Frequently out of stock — call ahead or check availability before planning around it
Buying tips
- Catless test pipes (ISR, DC Sports, Z1, Berk, Motordyne) are off-road/track use only in emissions-tested states and commonly trigger a check-engine light — budget for a CEL-fix resistor if you want it street-legal-looking.
- Catted high-flow options (Kinetix, Invidia, Fast Intentions, STILLEN) trade some peak flow for staying smog-legal and avoiding the CEL issue entirely.
- If drone and rasp are what’s stopped you from going catless before, Motordyne’s ART design is built specifically to address that, at a real price premium.
- All of these fit the VQ37VHR 370Z (2009-2020) and share compatibility with the related Infiniti G37/Q60 — double check your exact chassis code before ordering.
- A Y-pipe alone gives a modest, audible gain; most owners pair it with a cat-back exhaust and, for real power, a tune.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.