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Removed 3rd cat today... unwelcomed rasp

Started by Gray Brick, July 18, 2016, 01:33:53 AM

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Gray Brick

Replaced the 3rd cat today with a 2 1/2" X-pipe.

Patrial throttle I get an annoying rasp. No rasp on normal driving or full throttle.
I had a slight rasp prior to the X-pipe install.

Is this due to the flexible coupling on the downpipes?

My setup:
3" non catted downpipes
2 1/2" X-pipe
Stock resonater
Stock mufflers
Meth
Modified intake
Tune
2013 Ecoboost Ford Flex
AJP Tune (ATP+2) in progress , Livernois HPFP, 3 Bar MAP, UPR Catch Can, 100% Methanol w/ braided steel lines, 3" Downpipes -->2.5" X-pipe --> 2.5" Magnaflow exhaust, 2.5" air inlets to each turbo with cone filter, Custom water to air intercooler with chiller
275/40-20 Front 315/35-20 Rear Tires
---12.419ET/112.43MPH @ 5150 lbs in the 1/4---

ZSHO

#1
Is everything tight by the Flange pipe? Check for worn out insulators on the pipe which can exhibit a rattle or vibration and check for any play in that intermediate area especially having 3"DP without cat's preferably the passenger side ....think its #9 on the Diagram.  Z      When did your issues start?          http://www.levittownfordoemparts.com/auto-parts/2013/ford/flex/limited-trim/3-5l-v6-gas-engine/exhaust-system-cat/exhaust-components-scat


2013 Performance Package SHO| Livernois Custom Methanol Tune|3-Bar Map|Reische-170-Stat|Full Race Tial-10psi BOV in Black|PPE-Gloss Black Hot Pipes|EPP Dual Intake in Gloss Black|PPE Catted DP|Corsa Sport Cat Back Exhaust|H&R Sport-Springs|CFM Performance Billet Valve Cover Breather In Gloss Black|Llumar 20%Ceramic window Tint|MSD Ignition Coils in Black|Extreme Roof Spoiler|Redline Fluids all around|Gearhead Intercooler|First-SHO With Direct Port Alky-VP-M1-100%-Methanol Injection|LMS-Custom-Dyno-Tuned @ 415whp-465wtq| Best Trap Speed of 115.54 mph|

SHOdded

Catless downpipes (even some highflow catted downpipes) are known to expose the buzz/rasp of the engine.  No 3rd cat/X-pipe will only help propagate the issue.
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!