I am currently (its in the shop right now) getting a new 4" exhaust on my iroc. The exhaust will consist of Hooker long tube headers with 3" outlets coming into a custom fabricated Y pipe into the high flow catalitic converter. From the cat it will come out as a single 4" pipe into a muffler and out the one side.. Now the best part is that I am going to have a custom fabricated cutout just like the borla so I can run it straight thru wide open and it will still look pretty damn cool with two 4" chrome pipes coming out the back. Just thought I would let everyone know about the good news.

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Karsten
86 IROC-ZZ4... too much to list.

 

i may be wron but i think a 4 inch exhaust system is too much for your car. But im not sure because i dont see your mods or what motor your running

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92' camaro
New 305 block TPI conversion, Flat top pistons,Bore over .30 Forged parts all around,Edelbrock intake,ported plennum,ported corvette alluminum heads, accel cam,52mm throttle bodie, SLP runners Home aid cold air induction, Air foil,ford SVO 19lb injectors,fuel regulator,cloys timing chain, comp alluminum roller rocker arms and pushrods MSD 8.5 mm wires, bosch plattinum plugs, hypertech cap & rotor and coil, Edelbrock TES headers, free flowing catalytic converter and a 3 inch force II flowmaster exhaust system, and a 3 inch cutout,Zoom multi friction clutch, T-5 tranny,billenstien shocks&struts.
Soon to come!!!
Procharger system 12lbs o boost.
New paint job(hawaiin orchid purple)Cast alluminum ZR1 rims w/ 275 tires.
Favorite quote: "where ever u go, there u are"

Other car;
1971 plymouth Duster
Mods:340,edelbrock victor jr. intake, 650 4 barrel holley, heddman headers,40 series dual flowmasters, cold air intake,4:10 gears, just got a new paint job and cragar rims with 315 tires in the back.
:Yeah its not a chevy but damn how many 71' dusters have u seen in the streets.

 

GM ZZ4 crate engine with the following:
Moley Pushrods
-Crane Gold Series Roller Rockers 1.6 ratio
-Steel crank
-Forged Pistons (and one extra set thrown in)
-Edelbrock Valve Covers Polished Signiture Series (with the black
highlights)
-Complete Lingenfelter Intake Setup
-Lingenfelter Super Ram box full polsihed and ported
-heads are port matched
-lower TPI intake is fully ported and polished
Its a fairly serious engine and a supercharger or NOS should be added within the next year or two..

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Karsten
86 IROC-ZZ4... too much to list.

 

LOL, I think thats enough for a 4" exhaust!