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Message: <blockquote data-quote="dantei136" data-source="post: 1064223062" data-attributes="member: 110970">Hello All SIFUS brother & sister.Here I am facing a big problem with my car after get installed Mugen Twin Loop Replica Muffler on my car Honda CRV which is STOCK B20 Engine.After get installed the muffler...It feels very heavy to accelerate and soon I test my car top speed at highways this morning at about 4.00 AM I ONLY CAN REACH 120KMH!!!Before this I am easily get 170KMH...and sometime get 18oKMH on VERY straight long highway.What is actually the problem of my car.Oh my car is all STOCK but last two month I did cut the Catalyst Converter and replace it with straight pipi...so what is left is (EXTRACTOR -PIPES-RESONATOR BOX-MUFFLER) ALL STOCKAnd yes I did get some improvement from it!!But now after I installed a MUGEN TWIN LOOP REPLICA MUFFLER my car turn to be heavy to accelerateand the TOP SPEED ONLY 120KM AND CANT GO BEYOND!!!Is it really because of I dont have the Catalyst Converter for BACK PRESSURE work properly with theMUGEN TWIN LOOP REPLICA MUFFLER ????Do I have to buy a new Catalyst Converter so that I can get on my TOP END BACK or do I have to just replace it back with my UGLY STOCK MUFFLER ???IS IT THE MUFFLER PROBLEM OR I DONT HAVE CATALYST CONVERTER??PLEASE I AM REALLY IN A BIG HEADACHE</blockquote>

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