997S headers on a 3.4 996?
02-28-2011, 03:36 AM
#31
02-28-2011, 08:22 PM
#32
Three Wheelin'
its interesting to note that a company like cargraphic makes different headers for the 3.4 and 3.6 and they are not interchangeable... I always thought that headers gave you more in the upper at the expense of low end torque.. so for tracking this is great... now add to that a set of 100/200 cell xpipe cats which apparently boost up your midrange quite a bit (more than traditional non-xpipe cats) and that may be a good formula for still having mid *and* high end power with these two mods?
02-28-2011, 10:41 PM
#33
Poseur
Rennlist Member
Rennlist Member
Stock 997S headers are funny looking. X51 headers look nicer. Negatives are slightly higher weight (for the X51 headers) and some mid-range loss of torque.
02-28-2011, 11:17 PM
#34
Rocky Mountain High
Rennlist Member
Rennlist Member
The X51 header looks more like a proper header, and actually more like the 996 header than the 3.8 OEM header.
03-01-2011, 07:53 AM
#35
Sorry, but there 'difference between the headers 996 3.4 3.6 and 997 3.8 mk1 ? the last pictures are from the 997 mk2 but from 2009 .
996 oem 42 mm - 54 mm diameter external
996 x 51 48 mm - 54- ???
997 s mk1 ?
996 oem 42 mm - 54 mm diameter external
996 x 51 48 mm - 54- ???
997 s mk1 ?
05-20-2023, 02:55 PM
#36
Advanced
FWIW, I run the 3.8 (997S) headers on my 3.4 race car. I installed them with a GIAC street flash and switched to 98 octane fuel. I gained 33 rwhp on the same dyno 1 month apart. I don't often have that motor below 4500 rpms so I can't comment on low end torque loss if any. I also don't know if the 3.8 S headers are different than the 3.8 X51 headers...
