Replacement O2 sensors

[OLDMNSX]

Until someone with an early model car shows me a dyno with significant power gains, I am remaining skeptical.

I may be the "test case" here. I have a stock 91 that I am going to install a OEM exhaust system off of a 98. Now when I say "system" I mean from the engine exhaust ports on the heads to the muffler tips, the whole 9 yards. The only thing that is not bone stock on my engine is a K & N air filter element replacement into the OEM air box. It should be a good base line test.

Something that I have done to the 98 headers is to remove the weld bead on the inside of the flange and have the outside of the flange to header tube completely welded. I don't understand why the factory chose to weld on the inside where this will cause a flow restriction. I will take some pictures and post them for everyone to see.

There are a couple Dynos in the Boise area and I will check into doing a before and after install. This may clear up a lot of questions for everyone.

Brad

 

[nis350]

Until someone with an early model car shows me a dyno with significant power gains, I am remaining skeptical.

I think someone already did a na1 to na2 complete exhaust conversion with 14 hp gain.

Guess the real question is what that means in real life performance..... Is it noticeable in normal drive or only in the 6K+ RPM range?

 

[Big_D]

Until someone with an early model car shows me a dyno with significant power gains, I am remaining skeptical.

I had stock exhaust manufolds with my R/M exhaust and after I had the D/C Sports headers installed, I could feel a noticable increase in power mostly in the low rpm range. I wanted to do a before and after dyno, but it wasn't available when I took my car in. My tech said it increases an average of 14 hp for the headers when an aftermarket exhaust is used with it.