wht98ls1

i have a 98' a4 z28 and for the most part it is stock...... i am wanting to add lt headers and wanted to know how much hp to the wheels it could add....

12secSS

iTrader: (30)

10-20 rwhp, depending on the brand (style) and how close the AFR is to 12.8-13.0 after the install.

SladeX

I went from 306HP to 344HP with QTP longtube headers + true duals with cats and mufflers, 349 after tune. Despite having an A4, you should make a good amount with a 98 as we have a rich tune to begin with along with the 28lb injectors.

mike c.

iTrader: (1)

A good brand like kooks or something 25hp maybe more with a tune.

Brads LS1 02Z

iTrader: (16)

when i added my kooks i only picked up 9rwhp not counting the tune...

davered00ss

iTrader: (4)

25-30rwhp with a tune.

66deuce

iTrader: (1)

i got about 25 hp with the tune.98 Z/28 A4.hooker LTs with ORY