First Gen Spec V Header
B15 QR25DE and Spec V Header, fits 2002 to 2006 or so B15ís and Altimas, 4 to 1 header, increases performance and fuel economy, includes 2 ports for O2 sensors: $219

NISMO Spec-V Header - Improvements of 16 hp and 11.6 ft lb at the wheel: $553

JGY B15 3" Se-r cat back exhaust with magnaflow round muffler - 3" inlet $399 for the exhaust/muffler, $100 extra for stainless, (stainless shown above)

Magnaflow Stainless Steel 2.25" Single Cat-Back Exhaust System for the Se-r and Spec-V Sentras

• Reduces engine heat, back pressure and improves exhaust scavenging for high performance
• Manufactured from heavy-duty stainless steel
• Features a 2.25 inch tube
• Backed by lifetime warranty
• Uses mandrel bent piping for optimal flow
• Includes OEM placement resonator for improved sound quality
• Tip diameter is 4 inches and it’s an angle cut with resonated inner layer

Greddy’s awesome Evo TT exhaust for the 2002 and on Spec V. 60mm piping. Our price: $578.55, list is $609.

Greddy says: "It wasn't easy to improve on the popular Greddy SP system. But through customer feedback from over 10 years of use and testing, Greddy redesigned the SP as a full stainless steel cat-back exhaust system that is similarly priced to the original SP system. The new SP2 features a 304 stainless steel muffler canister with extra strong 430 SS end caps that feature a deep, high polish. Large, high volume mufflers provide maximum flow with a deep, pleasing tone and are especially effective when used on vehicles with aftermarket turbocharger systems. The unique outer curled oval tip (115 x 110mm dia.) is embossed with the famous Greddy logo. Employing state-of-the-art robotic seam welding, the single wall canisters feature increased rigidity for maximum durability and life. With over 35 types of internal perforated tubes, each SP2 application is specifically tuned for the best combination of sound and performance. The new SP2 also features thick walled (1.5mm); polished 304 stainless steel mandrel bent piping for better resonance and vibration control and enhanced corrosion resistance and durability. New lightweight, flared and stamped stainless steel flanges are also used to provide improved sealing characteristic."

Greddy's Evo II exhaust. Featuring 60mm to 70mm piping. Our price: $626.05 - list is $659.

Greddy says: "Inherent in its name, the EVO2 cat-back exhaust system is a huge step forward. In addition to the Greddy straight-through technology, offset tip design and large piping diameters of the original EVO, the EVO2 is now offered in full stainless steel providing improved looks, durability and corrosion resistance while maintaining the best qualities of the original such as fitment, sound and performance."