i currently have a full boar catback on my 98 4.6 . It sounds great and really brings out that burbuly Ford V-8 sound. Im thinkin of gutting my cats. running true duals ( 2.25 or 2.5 in.) back to dual 8 or 10 inch cherry bombs, then out the back into 4" chrome tips to make echo more. Any thoughts on this?

 

Don't gut your cats, if your looking for more performance get some high flow cats. If you gut your cats your truck will run like crap because of the O2 sensors.

John

 

but how much quieter will it be with the stock cats on than gutting them or getting hi flo cats--and approx how much is going to cost? around 400 total?

 

yea keep your stock cats or go with high flow cats. Catalytic converters only provide alittle amount of backpressure. When I got new cats on my truck recently, I regained my low end and the exhaust sounded nice and beefy. My exhaust is a y pipe behind the cat and no mufflers (needs mufflers) straigt out the back into 3" tips.

 

What about no mufflers with baffled chrome tips? A buddy from the muffler shop said he took off his muffler, put on a Y-pipe after the cat and duals out the back with the baffled tips. I haven't heard it yet, but he said it sounds great. Does the no muffler set-up affect anything (back pressure, etc)? His is a V8, mine is the V6, how would this sound?

Fabman

 

ive heard the no muffler takes torque away and wears on the exhaust valves hard. I wouldnt go with the no muffler system especially on 6 cyl it would be noisy and not a good tone. Put a good muffler on a 6 and itd sound good

 

how is this? .. i had a 98 mustang with the 4.6l engine and i didnt have any cats .. i had mil eliminators to turn off the rear o2 sensors (or trick them into thinking the cat was there) and my car ran perfectly .. it sounded really good too.... couldnt you do the same for the 4.6 or 5.4 trucks.. i was going to do this and i would like to know what the difference is .. seems like it would work the same way