98 Boxster Exhaust Expereince

[Supra-p!g]

I've recently started changing exhaust components to obtain the exhaust note that makes me smile on my long drives to work. First I purchased a used Instant-G muffler and C pipes from someone who had a 3.6l conversion. In fact, I think this exhaust system was made for the 3.6 conversion as a kit. It sounds very nice and 2.25 inch C pipes and inlets -- low tone sonics. I had a drone at 3K that was quite loud, but a lower tone, still good sound -- but made me tired on long drives. I decided to install 2 inch down pipes from the stock headers to the 2.25 inch C pipes. The drone is completely gone. In fact, I miss any sound without throttle. Albeit, it's a nice departure from the drone sound, it would be nice to have some sound when I let off the throttle. When on the throttle it sounds very nice!! And surprisingly, the car feels much less strained when accelerating. It's like a different car, like it can breath now. Lots more power even at lower RPM, and throughout the power band. I really like the way it easily accelerates at any speed.

 

So, a few questions:

 

1. How can gain back some of the lost sound on deceleration? -- Not a top priority, but if changing something means not having the power the way it is now -- then not worth it. 

2. Since the system is now essentially restriction free except for the minimally baffled muffler -- is this in any way harmful to the engine? It feels like the motor runs easier with less strain.

3. I tied the secondary O2 sensors up and out of the way. No CEL, but is this some how harming the ECU's attempt at a stoichiometric O2/Fuel mixture. I'm assuming that no default program is triggered by the lack of proper signal these are now sending to the ECU.

4. What do you think of this setup? 

[SteelStroke]

Bought a Bulaga Racing exhaust on Ebay for 300.  Sounds awesome.  No regrets.