If you don't want an updated ecu for one reason or another, an alternative would be o2 tubes or extenders. These are merely tube extensions that are threaded into the O2 bungs and allow only a small portion of the air into the O2 sensors fooling them into thinking everything is ok. This isn't a 100% fool proof method but it has worked for many. Considering a set of these will be under $100, there's not too much of a risk if it doesn't work out for your specific setup.

 

You make some good points. I was looking at the extenders. I was looking at both SpeedTech and Fabspeed. Speedtech are a little less on the X-pipe but also have the 90* O2 spacers. The SpeedTech offers the tube extenders and are about half the price.

 

Go with one with the best fitment. If you break it down, it's merely an extended tube with metered air going to the O2 sensors. Very simple concept and something you can probably fab yourself if with off the shelf parts from say Grainger or McMaster Carr if one chooses to put forth the effort.

Edit: Basically the DIY route would be something like these guys are selling: http://www.maxspeed-motorsports.com/minicat.html

 

I purchased O2 simulators for $14. No CEL light been running my setup for over a year.

 

Get the cat delete. Your turbines will be so loud. Here is the link (sample) of O2 simulator and how much it cost each. I got mine 2 for $14. You'll need about 2" length to receive full potential of the trick and not get CEL.

http://www.ebay.com/itm/Universal-Se...item4d08e3be51

 

Thanks for the link. That's a great price considering we're only really getting a piece of pipe.

 

I'm on a stock ECU and true some others might get a CEL with the mod but as in my case you might not either.

 

One more question. I'm on a quest to reduce weight so I am planning to get afterhours or supercups mufflers. I don't want muffler bypass so that I keep some back pressure.

With the cat delete, are you losing a lot of back pressure and low end torque?

 

You will still lose some back pressure with majority of the aftermarket mufflers out there. You're not gonna save that much weight going to supercups vs other aftermarket mufflers. Most aftermarket mufflers are around 10-12lbs each. Plus you'll be at max db if you use both cat bypass with one of the mufflers you mentioned, not to mention get pretty bad drone on the highway. If you plan on tracking the car, you better make sure your setup is within their noise limits as well.

You will most likely lose a bit low end with the cat bypass unless you get a tuned ecu. I would never personally use cat bypass without a tuned ecu to account for the low end. My $.02

 

Well looking at these: http://www.maxspeed-motorsports.com/996mb.html



Or these:



The Maxspeed I use my own tips and the claim that since they're longer and have bends in them you don't loose much back pressure. Also since they are longer and not directly off the cats may not be as loud.

Thoughts??

 

I will be going the cat delete route here in a few weeks. Much cheaper method, sound will be more aggressive as well as getting a few more HP compared to the 200 cells (which actually flow really well). O2 sensors spacers will take care of the CEL issue so no worries there!

Now to figure out exhaust tips...

 

You know I was looking at that as well but I saw a video on Fabspeed and the cat delete sounded kinda cannie whereas the muffler delete sounded more deep, I'd like to hear how you like your cat delete when you do it. If it did sound deep I'd go that route as well.

 

I don't rely heavily on sound clips to tell me exactly how an exhaust will sound. Recording them with a microphone and then having your speakers play it is not going to tell you the full tale of how it sounds exactly. I hear exhaust daily that go between with and without a cat and I really prefer without, nothing restricting your exhaust gasses will keep them moving faster.

Also keep in mind the rasp could have been due to the thickness of pipe used. There are plenty of aggressive sounding catless cars that sound mean and deep, with zero rasp.

 

Just as a side note, I have FVD 100 cell cats and I only get a CEL when I get below a 1/4 tank. When I get down to a 1/4th tank, I refill and have no light show up. May just be my car, but I've had them for a couple of months and have only had the light come on when I get low of fuel.

 

Are you sure the CEL you are throwing is P0420 (Catalyst below efficiency threshold)? Have you ever scanned the car for codes with the code on?

Amount of gas should not have any effect on your A/F ratio.