HWC Shorts: Dyno Day After ARH Headers

The 1993 Corvette returns to the dyno for another 3 runs to document the increase in power and torque, if any, we see from the installation of American Racing Headers headers and x-pipe.
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[@nikkoalpha2]

Another alternative to headers would be getting higher numerical rear differential gears. Many C4 automatics use 2:56 gears. Changing them to 3:07 gears makes a nice difference in performance. Replacing with 3:42 rear gears used in manual C4's make even a more dramatic difference.

[@taylo795]

Did you order headers through Michels Performance?

[@trollpatrolracing1535]

Yes

[@kjp67gto1]

How is the fitment of the American Racing headers? Any issues during the install?

[@trollpatrolracing1535]

It's a bit of a job when it comes to taking the stock manifolds off. They're so much more bulky than the headers. Biggest issue I remember is the driver side converter. On the passenger side the two bolt for the converters mounting bracket are reachable with and can be removed with a gear wrench. However the driver side is 3 bolt and none of them are easily accessible without dropping the transmission or other major removal, I don't know exactly what would need to be done because I just took a plasma cutter to the bracket lol. Once that's out of the way the header go in pretty easy from the bottom of the car, even enough clearance with a Canton road race oil pan. After that fitting the rest of the piping and takes some persuasion, but a little heat on the overlapping pipe end and a mallet with a block of wood it goes together without too much of an issue.

[@C4VETTELT1]

Did you do long tubes? And why didn't you have it tuned? Tuning it is where the extra HP comes from after doing the headers.

[@ebkbk9902]

Not many people tune our cars anymore. I had to learn and do everything my self with a aldl and laptop with tunerpro and tunercat. When i installed my headers i had added 4* of timing across the entire board and have no detonation it fersure seems a little meaner and cleaned up the smelly idle. You could also do a 0411 LS pcm swap by repinning the connectors and then you can utilize better software like hptuners etc.

[@trollpatrolracing1535]

Yes they are long tube, and we didn't do a tune specifically to document if there was a difference. So, in short science.

[@C4VETTELT1]

@ebk bk that's unfortunate!! I know of 3 places within 20 minutes of driving to get mine turned! I actually haven't done it yet because I just got it running correctly. The next step is a hypertech stage 2 chip and a dyno tune. I've done quite a bit and definitely need it tuned.

[@C4VETTELT1]

@@trollpatrolracing1535 oh their well definitely be a difference!!! I promise you that! Lol

[@Aqua350Lt1]

@@trollpatrolracing1535have you dynod it since the tune?

[@lasvegaslife5770]

I have no headers but did 2.5 exuast back from stock headers into an x pipe into flo master mufflers. Wonder if i got similar numbers in gains as u did..?