What kind of exhaust will give you the most performance but keep sound to near stock with same tips on a 1999 grand prix gtp?

Finding an exhaust system that maximizes performance on a 1999 Grand Prix GTP while maintaining near-stock sound levels with the same tips is a challenging goal. The inherent compromises between performance gains and sound dampening often clash. You'll likely need to make some compromises.

To get closest to your ideal, consider these strategies:

* Cat-back system with a focus on larger diameter piping: A cat-back exhaust system (everything from the catalytic converter back) using larger diameter piping than stock will improve exhaust flow and potentially offer some horsepower and torque increases. The key is finding a system that emphasizes sound muffling. Many manufacturers offer "quiet" or "street" versions of their cat-back systems.

* High-flow catalytic converter: Replacing the factory catalytic converter with a high-flow unit will reduce backpressure further improving performance. However, this *will* likely increase sound, even with a quiet cat-back.

* Muffler selection: This is crucial. Look for mufflers designed for performance with internal baffles and chambers to absorb sound. Some manufacturers offer different muffler options within a single cat-back system (e.g., a "performance" muffler versus a "touring" muffler). A touring muffler will be significantly quieter.

* Resonator addition (or replacement): Adding a resonator, or replacing the factory one with a more effective one, can help absorb sound frequencies that contribute to louder exhaust notes.

* Custom fabrication: The most optimal (but expensive) solution might be custom fabrication. A skilled exhaust shop could build a system precisely tailored to your needs, balancing performance and sound. They could use larger diameter piping, carefully select mufflers and resonators, and ensure proper fitment for your existing tips.

Realistic Expectations: You are unlikely to achieve truly "near-stock" sound with any performance gains, especially if you're changing the catalytic converter. Even the quietest performance cat-back will usually have a more noticeable exhaust note than the original system. The larger diameter piping alone will likely produce a slightly deeper and more resonant sound.

Recommendation: Start by researching cat-back exhaust systems for your 1999 Grand Prix GTP from reputable manufacturers. Read reviews focusing on sound levels as much as performance claims. Pay close attention to descriptions like "street," "touring," or "quiet." Calling the manufacturer directly to ask specific questions about sound levels is also advisable.