Thread: Picked up a used header, obstruction in secondary. Big deal?

Looks like this flex pipe had an internal mesh as well as outer. It detached at the front, will this obstruction be a big deal?

Running a '99 G20 with a '93 intake cam, stock cat and mandrel systems 2.25" catback with Maganaflow resonator and muffler.

That's not doing you any favors. Clean that stuff out. That's a serious restriction.

bet you wont feel the difference even if you do take all that out. not the end of the world on a stockish motor

It's fixed at the other end. Taking it out would be pretty hard. I have such a nice cat-back, I wanted a nice smooth ride. Maybe I'll leave it like this and replace the flex pipe in the spring.

I am mostly stock. Just want nice smooth and linear acceleration and a little gut. Driving is like dancing for me, any misstep kinda ruins the experience.

Anyone have any ideas what I might use to get that mesh out? It's connected to the flex pipe at the other end.

I've had luck removing similar obstructions by running an entire rotary tool with cutting disc down the tube. Or maybe one of those wand attachments for said rotary tool. It may take a lot of patience.

I thought the '93 intake cam was the same as 94-99, it was only the 91-92 cam that made the additional HP? Or maybe thats the 93.5

Cam specs, from the forums:

DE/DET cams
Jim Wolf Cams
S3 - .442" (11.2) LIFT / 260º DUR. - OVERLAP - 20º
S3HL -.457" (11.6) LIFT / 260º DUR.
S4 - .464" (11.8) LIFT / 266º DUR. - OVERLAP - 28º
S4HL -.484" (12.4) LIFT / 266º DUR.
S5 - .503" (12.8) LIFT / 281º DUR (avoid if you can, not a good cam)
S3R Roller Rocker - .450" (11.4) LIFT / 262º DUR - ??

C1 - .476" (12.1) LIFT / 264º DUR. - OVERLAP - 24º
C2 - .500" (12.7) LIFT / 275º DUR. - OVERLAP - 32º
C3 - .526" (13.4) LIFT / 285º DUR.

BrianCrower cams
BC stg 2 - .475" (12.1) LIFT / 264º DUR. (compares to JWT C1)
BC stg 3 - .495" (12.6) LIFT / 272º DUR. (compares to JWT C2)

Nissan (Original Equipment DE and DET)
Stock low port (94):
INTAKE - .362" (9.2) LIFT / 240º DUR. - EXHAUST - .362" (9.2) LIFT / 240º DUR - OVERLAP - 16º

Stock low port (95-up):
INTAKE - .339" (8.6) LIFT / 232º DUR. - EXHAUST - .362" (9.2) LIFT / 240º DUR - OVERLAP - 8º

Stock high port (91-93):
INTAKE - .394" (10.0) LIFT / 248º DUR - EXHAUST - .362" (9.2) LIFT / 240º DUR - OVERLAP - 16º

Stock GTI-R DET:
INTAKE - .394" (10.0) LIFT / 248º DUR - EXHAUST - .394" (10.0) LIFT / 248º DUR - OVERLAP - --º

ROLLER ROCKER CAMS
G20 2000-2002:
INTAKE - .370" (9.4) LIFT / 232º DUR - EXHAUST - .346" (8.8) LIFT / 240º DUR - OVERLAP - 8º

Sentra 2000:
INTAKE - .339" (8.6) LIFT / 240º DUR - EXHAUST - .362" (9.2) LIFT / 232º DUR - OVERLAP - 9º

Sentra 2001:
INTAKE - .370" (9.4) LIFT / 240º DUR - EXHAUST - .346" (8.8) LIFT / 232º DUR - OVERLAP - 9º


VVL CAMS
OE SR20VE cams
Low lobe INTAKE - .331" (8.4) LIFT /220º DUR - Low lobe EXHAUST -.260" (6.6) LIFT / 244º DUR - OVERLAP - 0º
High lobe INTAKE - .421" (10.7) LIFT /264º DUR - High lobe EXHAUST -.407" (10.34) LIFT / 268º DUR - OVERLAP - 48º

OE SR16VE:
Low lobe INTAKE - .279" (7.1) LIFT / 200º DUR - Low lobe EXHAUST - .313" (7.95) LIFT / 244º DUR - OVERLAP - 0º
High lobe INTAKE - .437" (11.1) LIFT / 280º DUR - High lobe EXHAUST - .437" (11.1) LIFT / 280º DUR - OVERLAP - 70º

OE SR16VE N1:
Low lobe INTAKE - .331" (8.4) LIFT / 220º DUR - Low lobe EXHAUST -.313" (7.95) LIFT / 244º DUR - OVERLAP - 0º - RED
High lobe INTAKE - .472" (12.0) LIFT / 288º DUR - High lobe EXHAUST -.469" (11.9) LIFT / 288º DUR - OVERLAP - 74º - GREEN

OE SR20VE 20V:
Low lobe INTAKE - .398" (10.11) LIFT /228º DUR - Low lobe EXHAUST - .327" (8.3) LIFT / 244º DUR - OVERLAP - ---º
High lobe INTAKE - .472" (12.0) LIFT /278º DUR - High lobe EXHAUST - .439" (11.15) LIFT / 280º DUR - OVERLAP - 57º

OE SR20VET:
Low lobe INTAKE - .315" (8.0) LIFT / 212º DUR - Low lobe EXHAUST -.445" (11.3) LIFT / 244º DUR - OVERLAP - 0º - PINK
High lobe INTAKE - .433" (11.0) LIFT / 248º DUR - High lobe EXHAUST (LOW Lobe is used) -.445" (11.3) LIFT / 244º DUR - OVERLAP - 13º - LIGHT GREEN

someone help a brother out filling in the xx's

Kelford 184-A:

Kelford 184-B:

Kelford 184-C:
Low lobe INTAKE - .xxx" LIFT / 266º DUR - Low lobe EXHAUST - .xxx" LIFT / 258º DUR
High Lobe INTAKE - .492" LIFT / 314º DUR - High lobe EXHAUST - .453" LIFT / 313º DUR

Kelford 184-C series II:
Low lobe INTAKE - .xxx" LIFT / xxxº DUR - Low lobe EXHAUST - .xxx" LIFT / xxxº DUR
High lobe INTAKE - .xxx" LIFT / xxxº DUR - High lobe EXHAUST - .xxx" LIFT / xxxº DUR

Oh cool, interesting info. Wouldn't be surprised though if some of those 1993.5's have the smaller cam. They are rare as bigfoot but I saw one once. 1993.5 lowport DE, original motor. Also automatic.

I have never seen a 1993.5 lowport....... did you get a picture?
91-93 intake cams are the same for almost all the chassis. The G20 model gave the A/T that was introduced in 1993.5 with a weaker cam.