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Old 10-08-2015, 07:40 PM   #1
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1998 Gt Exhaust Next Step

I have a 1998 mustang gt vert with full bolt ons...trick flow heads, cams, headers, hi flow cat...u name it and it's on there...with one exception. I don't have a cat back upgrade. Stock cat back system was left one as I didn't want a super loud car. My question is...am I losing any ponies from electing not to install a free flow cat back system? If so, any thought in how much? Currently with all bolt ons (No NOS) I am at 310 whp and 308 rwt. Thanks for any input and suggestions.

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Old 10-08-2015, 07:45 PM   #2
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My knowledge is low but I would be surprised if you swap to an aftermarket catback and find noticeable power.
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Old 10-08-2015, 08:38 PM   #3
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I agree ^

The exhaust is already pretty "free flowing" from the factory. You might gain a couple of horsepower with different mufflers but it won't be enough to actually feel.
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Old 10-08-2015, 09:05 PM   #4
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Dunno on 98.. 2.5 or 2.25 exhaust? If its the 2.5 then you could do with a new set of mufflers, high end maybe pick up a bit but no need fornew piping. If its the 2.25 junk like on the old fox bodies then yeah. But I think they did away with that nonsense with the 4.6.

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Old 10-09-2015, 09:32 AM   #5
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You'll notice extra power with a tune and the sound alone is worth it. If you don't want something super loud stick with a catted mid pipe and a Magnaflow exhaust. Its a nice tone and definitely know its aftermarket but its not much louder than stock.
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Old 10-09-2015, 01:56 PM   #6
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Wink

Everybody has opinions, so do I, except that I am the only correct one.
Yes, dual exhaust upgrade is needed before hitting the dyno with highest expectations.
My recommendations: Longtube headers ceramic coated, quality hi-flow cats, stainless steel MAC ProChamber, stainless steel piping & mufflers of choice. Tips of choice.
~Mufflers: Borla XR1Multitube, DR GAS, SpinTech, Flowmaster......
Have Fun With That!! Exhaust choices are the most enjoyable mod!!
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Old 10-09-2015, 02:17 PM   #7
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I thought Mac discontinued the stainless prochamber


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Old 10-09-2015, 02:27 PM   #8
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He says he already has all the exhaust done except the catback. Dumping $10k or so into that build plus the cost of the car and no catback... different strokes. Again, recommend Magnaflow for what the OP said he wanted.
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Old 10-10-2015, 12:32 AM   #9
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Quote:
Originally Posted by parkerz28 View Post
I thought Mac discontinued the stainless prochamber


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I hope not! They sent me two 3 years ago when the standard one was out of stock.
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