N E 1 have any dyno numbers for a stock 98....

[Performin Norman]

or one with smooth tubes and filters? I just ordered the Sean Roe filters and have smooth tubes and just want to know what to expect before and after the installs.

Thanks for your help.

 

[Supercharged Vipermad]

I suspect they'll be about the same as my '01 SAE numbers: 407 RWHP stock, 415 RWHP w/filters & tubes. If you have more miles (say, 10,000) on your GTS, your stock numbers may be 5-15HP higher. If your OEM air filters are dirty, the difference between stock and filter/tubes may be larger.

Post and let us know!

 

[Mike Brunton]

Norman,

My '98 GTS was dynoed with 20k miles on it. I have K&N's and smooth tubes, and removed the rear muffler.

It put down 415RWHP which was pretty decent, BUT, it put down 46RWTQ.

I don't think I've seen very many Vipers with TQ numbers that high. I think my rear straight pipe is too small, which is hurting HP but helping TQ. I am going to a complete new exhaust system this spring and will re-dyno to see the results.