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ASP Header/Exhaust Install (Dyno Inside)

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15K views 43 replies 29 participants last post by  onefstek  
#1 · (Edited)
ASP 4-1 long tube header and 2.5" exhaust with magnaflow muffler.

Dyno was performed before and after in the same day. Car has stock air box and filter.

Header with test pipe and defouler.
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2.5" stainless steel exhaust with magnaflow muffler
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Dyno before and after header and exhaust
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Edit:

A couple more pics that I took before and during the install.

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#2 ·
Hello all,

I wasn't going to post tonight since it was getting late, but since Stefan let the cat out of the bag, i guess i'll say a few words.
I would first like to thank Stefan and Charles for all their hard work and dealing with all my request. They totally went out of their way to provide me with a setup that was perfect for me. Thanks!
All i can say is i'm more than satisfied with the work and craftmanship of the parts.
I'm sure ASP will be more than happy to answer any questions anybody may have.
It's getting late...more tomorrow
 
#6 ·
Agreed on great looking header with great #'s.

What is the price on that work of art?

Its great to see so many options coming to the 8th...

Flash Pro/Cobb Ap
Skunk2/Kidd Racing Dominator/APS 2.5" headers
PWJDM Powerchamber

Now we just need more companies to make 2.5" exhausts.
 
#9 ·
Nice. Someone was just asking about a 4-1 header and now we have one. Great to have another company interested in the K20Z3 engine! Welcome aboard!

Also, thanks Stefan for not posting prices or advertising. The site has a strict policy on such things. Glad you noted that. Apply to become a sponsor here and then watch this header take off.

Edit: Stefan what is the collector size? I have added this to the Mother header thread and will add collector info when it becomes available.
 
#18 ·
NitrousG35,

All our headers are made custom to the motor spec that the customer gives us. So the primary and secondary lenght/diameter and collector size changes with every order.

So to give you a collector size is not really going to help, since it can change from one header to the next.

The size of the collector choke point can range between 2.25" up to 2.5" depending on the bore, stroke, evo (exhaust valve opening), evc (exhasut valve closing), valve lift and the power band the customer desires.

Stefan
 
#22 · (Edited)
Cleanest dyno sheet i've ever seen. multiple dyno runs before and after to record accurate number... Wow, Im impressed with how ASP does business.

Im impressed that the 4-1 header didn't lose any low end power. Was under the impression that 4-1 headers were all about top end (true RACE header) and 4-2-1 headers were for all around power increase but won't give as much top end. hmmm...


I can only imagine what the gains will be if you add a CAI and tune. :SHOCKED: Can anyone say mid range POWER?!?
 
#28 ·
Just got home from a hard days work. There's nothing like a nice drive with the stereo off to relax yourself. I can't find the words to explain how happy i am with ASP's work.
Coming from a former installer at a well known subaru performance shop and dealing with pretty much any brand available, that says a lot about the quality. I've been driving my Si for a year with absolutely zero performance modifications, because frankly...i haven't been impressed with the parts i've seen available. Sure i can buy something off the shelf thats designed for a stock si and i'm sure it would get the job done. I definitely wanted a setup that i can grow with when adding future mods. When ASP stepped up to the challenge of making the header and exhaust for my needs, i knew i was in good hands. They have a very strong rep for making quality products that plain and simply make more power and they stand behind 100 percent. I'm sure everyone has seen the dyno, the numbers speak for themselves! Believe me...my jaw dropped when i seen the numbers come up. I'll be more than happy to let Stefan take a vid or sound clip for whoever is interested. Thx!