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Vicious
08-07-2007, 02:26 PM
Hello -

I have a '97 D-90. Several years ago, I put larger pipes from the Catalytic converter back and a perfomance muffler on on the car. I am not sure if I got more horsepower. I think that exhaust sound increased a little. I was thinking about investing in an engine back system from NRP or BORLA. Has any one done this? Has it improved performance, MPG, anything else?

Please advise.

Thank you,

Syd

TSR53
08-07-2007, 02:49 PM
Back when I owned my '94 Defender 90 NAS Soft Top I put a NRP exhaust on and was pleased with it. My D90 had 48k miles when the original rear muffler needed replacing. I ended up installing this right before the long drive from VT > CO 2001 Solihull Nationals. Yup, we drove with the pop-up trailer with BFG Mud Terrains and new NRP all the way out and back. The BFGs ended up being louder than I thought :rolleyes:

http://c7716.r16.cf2.rackcdn.com/RN-Forum/users/TSR53/D90sport_ouray.jpg
(Taken half way down Black Bear Pass trial looking back up, Telluride, CO would be to the extreme right.)

The exhaust helped on Hwy 70 Vail Pass :thumb-up:. Not sure if it made any huge mpg improvement (I was towing a pop-up camper) but man did it sure sound good on full throttle going up Vail Pass. Oh, I also had a K&N air filter installed and removed the air intake horn for increased air, even if it was hot.