Looking at the above link I see in the instructions where they mention the pipe:
Locate the Ø3" aluminum tube with the multiple bends. Work the "S" bend portion up into the engine compartment and insert the other end (the end with the 90° bend) into the silicone coupler in the previous step. Secure with a #48 worm gear clamp.
However when looking at the parts list I can't see which part number that this one would be:
4fq212-030 disch asy, 2011 mstg5.0 1
[FONT=Arial,Arial][FONT=Arial,Arial]2A017-876-02 SPACER, .875 OD X 1.565 LONG 4
4[/FONT][/FONT]fq[FONT=Arial,Arial][FONT=Arial,Arial]012-040 [/FONT][/FONT]dischtube[FONT=Arial,Arial][FONT=Arial,Arial]B, 2011 MSTG GT 1
4[/FONT][/FONT]fq[FONT=Arial,Arial][FONT=Arial,Arial]012-050 [/FONT][/FONT]dischtube[FONT=Arial,Arial][FONT=Arial,Arial]C, 2011 MSTG GT 1
4FQ017-011 SPACER, TB, 1.25, 2011 MSTG GT 1
4FQ112-030 DISCH TUBE A, 2011 MSTG GT, BYPS 1
4GE012-030 DISCH TUBE A, 6.2 CAMARO SAT 2
4PGM012-010 ELBOW, REDUCER, 4X3.5, CAST 1
7C040-008 M4-.7X8MM SCHD SS 2
7C060-080 M6 X 1.00 X 80 SHCS CL 12.9 4
7C080-066 M8 X 1.25 X 65 HXHD CL10.9 4
7F008-021 NUT, M8 X 1.25, SERRATED FLG 4
7J006-093 6MM WASHER, PLATED 4
7J312-875 5/16" WASHER, CUSTOM 8
7P062-187 1/16 NPT X 3/16 HOSE BARB 1
7P375-250 3/8"X3/8"X1/4"MALE BARB TEE 1
7P500-001 1/2" HOSE UNION 4
7P500-016 TEE, .5 X .5 X 1/16 NPT, METAL 1
7PS300-275 REDUCER, BLK Ø3.0-Ø2.75 1
7PS300-300 SLEEVE, BLACK, 3.00D X 3.00 3
7PS300-301 BUMP HOSE, 3.00D X 3.00L 1
7PS350-200 SLEEVE, BLACK 3.50"IDX2.0"LG 1
7PS350-304 SLEEVE, BLK, 3.5" X 3.0"[/FONT][/FONT]l [FONT=Arial,Arial][FONT=Arial,Arial]1
7PS400-300 SLEEVE, BLK, 4.0" X 3.0"[/FONT][/FONT]l [FONT=Arial,Arial][FONT=Arial,Arial]1
7PS400-301 REDUCER, HUMP, PROG 3.0 X 4.0 1
7R002-044 #44 SAE TYPE F SS HOSE CLAMP 1
7R002-048 #48 SAE TYPE F SS HOSE CLAMP 9
7R002-052 #52 SAE TYPE F SS HOSE CLAMP 4
7R002-056 #56 SAE TYPE F SS HOSE CLAMP 5
7R002-064 #64 SAE TYPE F SS HOSE CLAMP 3
7R004-687 STPLS CLAMP, 13/16", 1 EAR 8
7S300-003 RUBBER ELBOW 3" MODIFIED 2
7S350-120 ELBOW, Ø3.5", 120º, 2.5" C.L. 1
7S350-220 ASM, FLOW STRAIGHTENER, 3.5 OD 1
7U012-238 O-RING, 2-238, 3.484ID X .139 1
7U030-187 VACUUM HOSE, 3/16 48 IN
7U030-036 1/2" OIL DRAIN HOSE 3 FT
8A003-071 MAF, 3.8ID, 05 MSTG GT 1
8H040-175 FILTER, 1.75"ID, RACE BYPS 1
[/FONT][/FONT]8D204-010 RACE BYPASS VALVE-BLACK/SAT 1
8PN101-050 WELDED CAC CORE ASY 1