Installed my X51 headers and AWE cats

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08-08-2007, 12:16 AM

#16

Sharptt

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Quote:

Originally Posted by Dave07997S

today. Started at 1530 and I finished at 1900 hrs. Took me 3.5 hrs for the tear apart and reinstall. Did it completely by myself with ramps.....man I wish I had a lift. It would have shaved an easy 1hr. off the time. Very straight forward, everything fit perfectly. I did it without having to take the muffers off as I just installed them 2 weeks ago. I did loosen the 3 bolts that are bracketed on the muffer to give them some leeway. Haven't had a chance to really drive the car or hear how she sounds now. I will report back later..

Dave

Hi Dave
I did the X51 header and sport mufflers a while ago. I loved the new sound but wanted more power...so last week I added a set of AWE sport cats. Now I love the added power but feel the car may be a bit too loud. Did you also notice a nice bump in power but also more exhaust noise?

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08-08-2007, 02:23 AM

#17

Edgy01

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Just leaving the PSE on. They already sound great. Camber on the left rear I'm sure is contributing to the inside tire wear,--but for 17,000 miles on the Bridgestones I'm not complaining!

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08-08-2007, 02:32 AM

#18

Edgy01

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Spent some time cleaning up the X51 headers prior to installation. The inside welds were a bit messy. Before, and after ports and the tools used.

Attached Images

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08-08-2007, 03:53 AM

#19

Maison

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Did it feel any different or better? (The throttle I mean)

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08-08-2007, 04:04 AM

#20

Edgy01

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Quote:

Originally Posted by Maison

Did it feel any different or better? (The throttle I mean)

I can't say that I felt any throttle differences. I'm thinking that the exhaust sound may be a little deeper,--but it could easily be my imagination.

Unfortunately, I didn't have the opportunity to put it on an engine dyno and make some tests prior to changing it over.

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08-08-2007, 07:02 AM

#21

Dave07997S

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Quote:

Originally Posted by Sharptt

I did the headers and cats at the same time. I had just AWE mufflers in the beginning and felt actually the car wasnt really louder than stock, well maybe a little. Adding the headers and cats did add more music

to the exhaust note (I hate to call that noise). The higher flow cats do add quite a bit more volume to the exhaust note. The headers dont add much if any really to the exhaust note.

Dave

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02-15-2010, 11:16 PM

#22

michaeldantep

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Quote:

Originally Posted by Edgy01

Installed mine late last week. Will post photos. It's a no-brainer. (It doesn't hurt to have a brother in law with a 18-bay shop...)

Orignal 3.8 headers on top, and the X51 headers below.

Wow, great pics. What a difference in the two headers!

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02-28-2010, 04:47 AM

#23

stv951

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bump on this
Anyone has the X51 headers part nos ?
Anyone has some measurable performance gains from them ?
Will those fit the C2 3,6 997 ?
Is it really worth it ?

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11-12-2012, 09:52 AM

#24

kkswow12

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Quote:

Originally Posted by Edgy01

Spent some time cleaning up the X51 headers prior to installation. The inside welds were a bit messy. Before, and after ports and the tools used.

dan, do you think cleaning up that area makes a difference? i can't imagine that there is any real airflow at that early point...airflow must still be pretty turbulent, just a thought, and i''m no engineer, but would llike to know more as i have the x-51 as well and would love to maximize what is already pretty impressive, and would that affect sound also?

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11-12-2012, 09:56 AM

#25

kkswow12

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sorry for the redundancy, i didn't read all the posts, just stopped and replied when i saw your pics... and i have always wanted 'ported and polished' headers

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11-12-2012, 11:08 AM

#26

cairo94507

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Wow! Nice pictures showing the difference between the stock and the X-51 headers. It does look like it would be a pretty straight forward swap.

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11-13-2012, 05:15 PM

#27

rsabeebe

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Quote:

Originally Posted by Dave07997S

$570 for the pair shipped to me...I too like to use OEM when I can. Next project conversion to X51 intake, throttle body...yea baby!!

Dave

Can you tell me when they offered you that price. I contacted them yesterday and they are quoting $410 per header. Quite a difference and curious what discounts, etc. you may have used to get that price. Thanks!!