If you want a deeper, more aggressive tone out of your Nissan 370Z without re-engineering the whole exhaust, the ISR Performance ST Series is a Y-pipe-back system built to bolt right onto your factory setup. It picks up at the stock Y-pipes with a 3 inch flange, splits into dual 2.5 inch pipes with bottle resonators, and finishes at an aggressive dual muffler section capped with 4 inch tips. The result is the deep note enthusiasts are after, paired with a look that backs it up.
What It Is
The ISR Performance ST Series Exhaust is a Y-pipe-back exhaust system for the Nissan 370Z Z34. It uses a stainless steel 2-bolt 3 inch flange that splits into two 2.5 inch pipes with bottle style resonators, then continues back to an aggressive muffler section with 4 inch tips. It's designed to bolt directly to the vehicle's stock Y-pipes, replacing the factory mid-pipe and rear muffler in one system.
What It Does
This system replaces the restrictive and quiet factory mid-pipe and muffler with a freer-flowing, better-sounding setup. The dual 2.5 inch pipes open up flow over the stock piping, the bottle style resonators tune the tone and keep harsh rasp in check, and the aggressive muffler section delivers the deep note the 370Z is known for when it's properly opened up. Because it's a Y-pipe-back design, it keeps your factory Y-pipes in place and swaps everything behind them, which is what makes it a clean bolt-on rather than a full exhaust overhaul.
Tone and Construction
The ST Series is built around a deep, aggressive tone rather than a high-pitched buzz. The bottle style resonators do the work of smoothing out the sound, taming the rasp that open dual setups can produce while letting the aggressive muffler section give you volume and depth. The stainless steel construction handles exhaust heat and resists corrosion better than mild steel, and the dual 4 inch tips give the back of the car a presence that matches the way it sounds.
Direct Bolt-On Design
This is a Y-pipe-back system, which means it bolts directly to your factory Y-pipes and replaces the mid-pipe and rear muffler. The stainless 2-bolt 3 inch flange mates to the stock setup, and the gaskets and hardware needed to install it are included in the box. There's no welding and no cutting required, just unbolt the factory mid-pipe and muffler and bolt the ST Series in their place.
Fitment and Compatibility
This exhaust is designed specifically for the following:
- Nissan 370Z (Z34)
It bolts directly to the factory 370Z Y-pipes, replacing the stock mid-pipe and rear muffler. The 2-bolt 3 inch flange is sized to mate to the stock Y-pipe outlet. Confirm your Y-pipes are factory or factory-spec before purchasing so the flange lines up as intended.
Who This Is For
This exhaust fits a specific owner. If you want a deeper, more aggressive tone out of your 370Z and you like the look of dual 4 inch tips, this is built for exactly that. If you want a true bolt-on that keeps your factory Y-pipes and swaps the mid-pipe and muffler without welding or fabrication, this is a straightforward install. If you want stainless steel construction and tuned resonators rather than a cheap, raspy setup, the ST Series is built to sound good rather than just loud.
This is not the right exhaust if you're after the quietest possible setup for a comfort-focused daily, since this is designed to be aggressive. It's also not the pick if you've already replaced your Y-pipes with non-factory-spec piping that won't mate to the 3 inch flange, in which case you'll want to confirm fitment first.
What's in the Box
- 1x Resonator section
- 2x Muffler section with 4 inch tips
- 3x 2-bolt 2.5 inch gaskets
- 6x Bolts
- 6x Nuts
Installation Notes
Professional installation is recommended, though this is a direct bolt-on with no welding required. Unbolt the factory mid-pipe and rear muffler, then bolt the ST Series resonator and muffler sections in their place using the included gaskets and hardware. Let the exhaust cool completely before working on it, support the system while you connect the sections, and check all flange connections for leaks after the first heat cycle. A lift makes the job faster, but a careful builder with jack stands and basic hand tools can handle it.
Product Details
Brand: ISR Performance
Product: ST Series Exhaust
Vehicle Fitment: Nissan 370Z (Z34)
System Type: Y-pipe-back
Material: Stainless steel
Flange: 2-bolt 3 inch
Piping: Dual 2.5 inch with bottle style resonators
Muffler: Dual aggressive muffler section
Tips: Dual 4 inch
Installation: Direct bolt-on, gaskets and hardware included
Key Benefits: Deep aggressive tone, dual 2.5 inch piping with tuned bottle resonators, stainless steel construction, dual 4 inch tips, direct bolt-on to factory Y-pipes with all hardware included